

<!--Generated by Disclosure Solutions PROFILE 1.1.1.0 Copyright 1995 - 2012 Thomson Reuters Accelus. All rights reserved.-->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:t1="http://xbrl.org/2005/xbrldt">
  <link:roleRef roleURI="http://belfuse.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#SubsequentEventsDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#RelatedPartyTransactionsDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/LegalProceedingsDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#LegalProceedingsDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#AccumulatedOtherComprehensiveLossDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/CommonStockDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#CommonStockDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/RetirementFundAndProfitSharingPlanDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#RetirementFundAndProfitSharingPlanDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/DebtDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#DebtDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/AccruedExpensesDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#AccruedExpensesDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/IncomeTaxesDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#IncomeTaxesDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/BusinessSegmentInformationDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#BusinessSegmentInformationDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/InventoriesDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#InventoriesDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/FairValueMeasurementsDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#FairValueMeasurementsDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/RestructuringActivitiesDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#RestructuringActivitiesDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/AcquisitionsDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#AcquisitionsDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/EarningsPerShareDetails" xlink:type="simple" xlink:href="belfb-20120930.xsd#EarningsPerShareDetails" />
  <link:roleRef roleURI="http://belfuse.com/role/AccumulatedOtherComprehensiveLossTables" xlink:type="simple" xlink:href="belfb-20120930.xsd#AccumulatedOtherComprehensiveLossTables" />
  <link:roleRef roleURI="http://belfuse.com/role/RetirementFundAndProfitSharingPlanTables" xlink:type="simple" xlink:href="belfb-20120930.xsd#RetirementFundAndProfitSharingPlanTables" />
  <link:roleRef roleURI="http://belfuse.com/role/AccruedExpensesTables" xlink:type="simple" xlink:href="belfb-20120930.xsd#AccruedExpensesTables" />
  <link:roleRef roleURI="http://belfuse.com/role/BusinessSegmentInformationTables" xlink:type="simple" xlink:href="belfb-20120930.xsd#BusinessSegmentInformationTables" />
  <link:roleRef roleURI="http://belfuse.com/role/InventoriesTables" xlink:type="simple" xlink:href="belfb-20120930.xsd#InventoriesTables" />
  <link:roleRef roleURI="http://belfuse.com/role/FairValueMeasurementsTables" xlink:type="simple" xlink:href="belfb-20120930.xsd#FairValueMeasurementsTables" />
  <link:roleRef roleURI="http://belfuse.com/role/RestructuringActivitiesTables" xlink:type="simple" xlink:href="belfb-20120930.xsd#RestructuringActivitiesTables" />
  <link:roleRef roleURI="http://belfuse.com/role/AcquisitionsTables" xlink:type="simple" xlink:href="belfb-20120930.xsd#AcquisitionsTables" />
  <link:roleRef roleURI="http://belfuse.com/role/EarningsPerShareTables" xlink:type="simple" xlink:href="belfb-20120930.xsd#EarningsPerShareTables" />
  <link:roleRef roleURI="http://belfuse.com/role/SubsequentEvents" xlink:type="simple" xlink:href="belfb-20120930.xsd#SubsequentEvents" />
  <link:roleRef roleURI="http://belfuse.com/role/RelatedPartyTransactions" xlink:type="simple" xlink:href="belfb-20120930.xsd#RelatedPartyTransactions" />
  <link:roleRef roleURI="http://belfuse.com/role/LegalProceedings" xlink:type="simple" xlink:href="belfb-20120930.xsd#LegalProceedings" />
  <link:roleRef roleURI="http://belfuse.com/role/AccumulatedOtherComprehensiveLoss" xlink:type="simple" xlink:href="belfb-20120930.xsd#AccumulatedOtherComprehensiveLoss" />
  <link:roleRef roleURI="http://belfuse.com/role/CommonStock" xlink:type="simple" xlink:href="belfb-20120930.xsd#CommonStock" />
  <link:roleRef roleURI="http://belfuse.com/role/RetirementFundAndProfitSharingPlan" xlink:type="simple" xlink:href="belfb-20120930.xsd#RetirementFundAndProfitSharingPlan" />
  <link:roleRef roleURI="http://belfuse.com/role/Debt" xlink:type="simple" xlink:href="belfb-20120930.xsd#Debt" />
  <link:roleRef roleURI="http://belfuse.com/role/AccruedExpenses" xlink:type="simple" xlink:href="belfb-20120930.xsd#AccruedExpenses" />
  <link:roleRef roleURI="http://belfuse.com/role/IncomeTaxes" xlink:type="simple" xlink:href="belfb-20120930.xsd#IncomeTaxes" />
  <link:roleRef roleURI="http://belfuse.com/role/BusinessSegmentInformation" xlink:type="simple" xlink:href="belfb-20120930.xsd#BusinessSegmentInformation" />
  <link:roleRef roleURI="http://belfuse.com/role/Inventories" xlink:type="simple" xlink:href="belfb-20120930.xsd#Inventories" />
  <link:roleRef roleURI="http://belfuse.com/role/FairValueMeasurements" xlink:type="simple" xlink:href="belfb-20120930.xsd#FairValueMeasurements" />
  <link:roleRef roleURI="http://belfuse.com/role/RestructuringActivities" xlink:type="simple" xlink:href="belfb-20120930.xsd#RestructuringActivities" />
  <link:roleRef roleURI="http://belfuse.com/role/Acquisitions" xlink:type="simple" xlink:href="belfb-20120930.xsd#Acquisitions" />
  <link:roleRef roleURI="http://belfuse.com/role/EarningsPerShare" xlink:type="simple" xlink:href="belfb-20120930.xsd#EarningsPerShare" />
  <link:roleRef roleURI="http://belfuse.com/role/BasisOfPresentationAndAccountingPolicies" xlink:type="simple" xlink:href="belfb-20120930.xsd#BasisOfPresentationAndAccountingPolicies" />
  <link:roleRef roleURI="http://belfuse.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="simple" xlink:href="belfb-20120930.xsd#CondensedConsolidatedStatementsOfCashFlowsUnaudited" />
  <link:roleRef roleURI="http://belfuse.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical" xlink:type="simple" xlink:href="belfb-20120930.xsd#CondensedConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical" />
  <link:roleRef roleURI="http://belfuse.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:type="simple" xlink:href="belfb-20120930.xsd#CondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" />
  <link:roleRef roleURI="http://belfuse.com/role/CondensedConsolidatedStatementsOfOperationsUnaudited" xlink:type="simple" xlink:href="belfb-20120930.xsd#CondensedConsolidatedStatementsOfOperationsUnaudited" />
  <link:roleRef roleURI="http://belfuse.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" xlink:href="belfb-20120930.xsd#CondensedConsolidatedBalanceSheetsUnauditedParenthetical" />
  <link:roleRef roleURI="http://belfuse.com/role/CondensedConsolidatedBalanceSheetsUnaudited" xlink:type="simple" xlink:href="belfb-20120930.xsd#CondensedConsolidatedBalanceSheetsUnaudited" />
  <link:roleRef roleURI="http://belfuse.com/role/DocumentAndEntityInformation" xlink:type="simple" xlink:href="belfb-20120930.xsd#DocumentAndEntityInformation" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/DocumentAndEntityInformation">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityInformationLineItems" xlink:label="EntityInformationLineItems" xlink:title="EntityInformationLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityRegistrantName" xlink:label="EntityRegistrantName" xlink:title="EntityRegistrantName" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="EntityRegistrantName" xlink:title="definition: EntityInformationLineItems to EntityRegistrantName" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="EntityCentralIndexKey" xlink:title="EntityCentralIndexKey" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="EntityCentralIndexKey" xlink:title="definition: EntityInformationLineItems to EntityCentralIndexKey" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="CurrentFiscalYearEndDate" xlink:title="CurrentFiscalYearEndDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="CurrentFiscalYearEndDate" xlink:title="definition: EntityInformationLineItems to CurrentFiscalYearEndDate" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="EntityWellKnownSeasonedIssuer" xlink:title="EntityWellKnownSeasonedIssuer" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="EntityWellKnownSeasonedIssuer" xlink:title="definition: EntityInformationLineItems to EntityWellKnownSeasonedIssuer" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="EntityVoluntaryFilers" xlink:title="EntityVoluntaryFilers" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="EntityVoluntaryFilers" xlink:title="definition: EntityInformationLineItems to EntityVoluntaryFilers" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="EntityCurrentReportingStatus" xlink:title="EntityCurrentReportingStatus" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="EntityCurrentReportingStatus" xlink:title="definition: EntityInformationLineItems to EntityCurrentReportingStatus" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityFilerCategory" xlink:label="EntityFilerCategory" xlink:title="EntityFilerCategory" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="EntityFilerCategory" xlink:title="definition: EntityInformationLineItems to EntityFilerCategory" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="EntityCommonStockSharesOutstanding" xlink:title="EntityCommonStockSharesOutstanding" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="EntityCommonStockSharesOutstanding" xlink:title="definition: EntityInformationLineItems to EntityCommonStockSharesOutstanding" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="DocumentFiscalYearFocus" xlink:title="DocumentFiscalYearFocus" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="DocumentFiscalYearFocus" xlink:title="definition: EntityInformationLineItems to DocumentFiscalYearFocus" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="DocumentFiscalPeriodFocus" xlink:title="DocumentFiscalPeriodFocus" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="DocumentFiscalPeriodFocus" xlink:title="definition: EntityInformationLineItems to DocumentFiscalPeriodFocus" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentType" xlink:label="DocumentType" xlink:title="DocumentType" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="DocumentType" xlink:title="definition: EntityInformationLineItems to DocumentType" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_AmendmentFlag" xlink:label="AmendmentFlag" xlink:title="AmendmentFlag" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="AmendmentFlag" xlink:title="definition: EntityInformationLineItems to AmendmentFlag" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="DocumentPeriodEndDate" xlink:title="DocumentPeriodEndDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityInformationLineItems" xlink:to="DocumentPeriodEndDate" xlink:title="definition: EntityInformationLineItems to DocumentPeriodEndDate" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntitiesTable" xlink:label="EntitiesTable" xlink:title="EntitiesTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="EntityInformationLineItems" xlink:to="EntitiesTable" xlink:title="definition: EntityInformationLineItems to EntitiesTable" order="14.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="StatementClassOfStockAxis" xlink:title="StatementClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="EntitiesTable" xlink:to="StatementClassOfStockAxis" xlink:title="definition: EntitiesTable to StatementClassOfStockAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain_2" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain_2" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="CommonClassAMember" xlink:title="CommonClassAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassAMember" xlink:title="definition: ClassOfStockDomain to CommonClassAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="CommonClassBMember" xlink:title="CommonClassBMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassBMember" xlink:title="definition: ClassOfStockDomain to CommonClassBMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/CondensedConsolidatedBalanceSheetsUnaudited">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="StatementLineItems" xlink:title="StatementLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="LiabilitiesAndStockholdersEquityAbstract" xlink:title="LiabilitiesAndStockholdersEquityAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="LiabilitiesAndStockholdersEquityAbstract" xlink:title="definition: StatementLineItems to LiabilitiesAndStockholdersEquityAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="LiabilitiesCurrentAbstract" xlink:title="LiabilitiesCurrentAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="LiabilitiesCurrentAbstract" xlink:title="definition: StatementLineItems to LiabilitiesCurrentAbstract" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract" xlink:label="LiabilitiesNoncurrentAbstract" xlink:title="LiabilitiesNoncurrentAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="LiabilitiesNoncurrentAbstract" xlink:title="definition: StatementLineItems to LiabilitiesNoncurrentAbstract" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="CommitmentsAndContingencies" xlink:title="CommitmentsAndContingencies" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="CommitmentsAndContingencies" xlink:title="definition: StatementLineItems to CommitmentsAndContingencies" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="StockholdersEquityAbstract" xlink:title="StockholdersEquityAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="StockholdersEquityAbstract" xlink:title="definition: StatementLineItems to StockholdersEquityAbstract" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="PreferredStockValue" xlink:title="PreferredStockValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="PreferredStockValue" xlink:title="definition: StatementLineItems to PreferredStockValue" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockValue" xlink:label="CommonStockValue" xlink:title="CommonStockValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="CommonStockValue" xlink:title="definition: StatementLineItems to CommonStockValue" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="AdditionalPaidInCapitalCommonStock" xlink:title="AdditionalPaidInCapitalCommonStock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="AdditionalPaidInCapitalCommonStock" xlink:title="definition: StatementLineItems to AdditionalPaidInCapitalCommonStock" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="RetainedEarningsAccumulatedDeficit" xlink:title="RetainedEarningsAccumulatedDeficit" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="RetainedEarningsAccumulatedDeficit" xlink:title="definition: StatementLineItems to RetainedEarningsAccumulatedDeficit" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:title="AccumulatedOtherComprehensiveIncomeLossNetOfTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:title="definition: StatementLineItems to AccumulatedOtherComprehensiveIncomeLossNetOfTax" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="StockholdersEquity" xlink:title="StockholdersEquity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="StockholdersEquity" xlink:title="definition: StatementLineItems to StockholdersEquity" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="LiabilitiesAndStockholdersEquity" xlink:title="LiabilitiesAndStockholdersEquity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="LiabilitiesAndStockholdersEquity" xlink:title="definition: StatementLineItems to LiabilitiesAndStockholdersEquity" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilityForUncertainTaxPositionsNoncurrent" xlink:label="LiabilityForUncertainTaxPositionsNoncurrent" xlink:title="LiabilityForUncertainTaxPositionsNoncurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="LiabilityForUncertainTaxPositionsNoncurrent" xlink:title="definition: StatementLineItems to LiabilityForUncertainTaxPositionsNoncurrent" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:title="PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:title="definition: StatementLineItems to PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="OtherLiabilitiesNoncurrent" xlink:title="OtherLiabilitiesNoncurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="OtherLiabilitiesNoncurrent" xlink:title="definition: StatementLineItems to OtherLiabilitiesNoncurrent" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="LiabilitiesNoncurrent" xlink:title="LiabilitiesNoncurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="LiabilitiesNoncurrent" xlink:title="definition: StatementLineItems to LiabilitiesNoncurrent" order="16.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Liabilities" xlink:label="Liabilities" xlink:title="Liabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="Liabilities" xlink:title="definition: StatementLineItems to Liabilities" order="17.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="AccountsPayableCurrent" xlink:title="AccountsPayableCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="AccountsPayableCurrent" xlink:title="definition: StatementLineItems to AccountsPayableCurrent" order="18.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="AccruedLiabilitiesCurrent" xlink:title="AccruedLiabilitiesCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="AccruedLiabilitiesCurrent" xlink:title="definition: StatementLineItems to AccruedLiabilitiesCurrent" order="19.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringReserveCurrent" xlink:label="RestructuringReserveCurrent" xlink:title="RestructuringReserveCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="RestructuringReserveCurrent" xlink:title="definition: StatementLineItems to RestructuringReserveCurrent" order="20.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NotesPayableCurrent" xlink:label="NotesPayableCurrent" xlink:title="NotesPayableCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="NotesPayableCurrent" xlink:title="definition: StatementLineItems to NotesPayableCurrent" order="21.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="AccruedIncomeTaxesCurrent" xlink:title="AccruedIncomeTaxesCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="AccruedIncomeTaxesCurrent" xlink:title="definition: StatementLineItems to AccruedIncomeTaxesCurrent" order="22.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DividendsPayableCurrent" xlink:label="DividendsPayableCurrent" xlink:title="DividendsPayableCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="DividendsPayableCurrent" xlink:title="definition: StatementLineItems to DividendsPayableCurrent" order="23.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="LiabilitiesCurrent" xlink:title="LiabilitiesCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="LiabilitiesCurrent" xlink:title="definition: StatementLineItems to LiabilitiesCurrent" order="24.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="StatementTable" xlink:title="StatementTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="StatementLineItems" xlink:to="StatementTable" xlink:title="definition: StatementLineItems to StatementTable" order="25.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="StatementClassOfStockAxis" xlink:title="StatementClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="StatementTable" xlink:to="StatementClassOfStockAxis" xlink:title="definition: StatementTable to StatementClassOfStockAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain_2" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain_2" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="CommonClassAMember" xlink:title="CommonClassAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassAMember" xlink:title="definition: ClassOfStockDomain to CommonClassAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="CommonClassBMember" xlink:title="CommonClassBMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassBMember" xlink:title="definition: ClassOfStockDomain to CommonClassBMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="StatementLineItems" xlink:title="StatementLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="AssetsAbstract" xlink:title="AssetsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="AssetsAbstract" xlink:title="definition: StatementLineItems to AssetsAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="LiabilitiesAndStockholdersEquityAbstract" xlink:title="LiabilitiesAndStockholdersEquityAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="LiabilitiesAndStockholdersEquityAbstract" xlink:title="definition: StatementLineItems to LiabilitiesAndStockholdersEquityAbstract" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="StockholdersEquityAbstract" xlink:title="StockholdersEquityAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="StockholdersEquityAbstract" xlink:title="definition: StatementLineItems to StockholdersEquityAbstract" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockNoParValue" xlink:label="PreferredStockNoParValue" xlink:title="PreferredStockNoParValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="PreferredStockNoParValue" xlink:title="definition: StatementLineItems to PreferredStockNoParValue" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="PreferredStockSharesAuthorized" xlink:title="PreferredStockSharesAuthorized" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="PreferredStockSharesAuthorized" xlink:title="definition: StatementLineItems to PreferredStockSharesAuthorized" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="PreferredStockSharesIssued" xlink:title="PreferredStockSharesIssued" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="PreferredStockSharesIssued" xlink:title="definition: StatementLineItems to PreferredStockSharesIssued" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="CommonStockParOrStatedValuePerShare" xlink:title="CommonStockParOrStatedValuePerShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="CommonStockParOrStatedValuePerShare" xlink:title="definition: StatementLineItems to CommonStockParOrStatedValuePerShare" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="CommonStockSharesAuthorized" xlink:title="CommonStockSharesAuthorized" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="CommonStockSharesAuthorized" xlink:title="definition: StatementLineItems to CommonStockSharesAuthorized" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="CommonStockSharesOutstanding" xlink:title="CommonStockSharesOutstanding" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="CommonStockSharesOutstanding" xlink:title="definition: StatementLineItems to CommonStockSharesOutstanding" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="TreasuryStockShares" xlink:title="TreasuryStockShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="TreasuryStockShares" xlink:title="definition: StatementLineItems to TreasuryStockShares" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="AssetsCurrentAbstract" xlink:title="AssetsCurrentAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="AssetsCurrentAbstract" xlink:title="definition: StatementLineItems to AssetsCurrentAbstract" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="AllowanceForDoubtfulAccountsReceivableCurrent" xlink:title="AllowanceForDoubtfulAccountsReceivableCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="AllowanceForDoubtfulAccountsReceivableCurrent" xlink:title="definition: StatementLineItems to AllowanceForDoubtfulAccountsReceivableCurrent" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="StatementTable" xlink:title="StatementTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="StatementLineItems" xlink:to="StatementTable" xlink:title="definition: StatementLineItems to StatementTable" order="13.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="StatementClassOfStockAxis" xlink:title="StatementClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="StatementTable" xlink:to="StatementClassOfStockAxis" xlink:title="definition: StatementTable to StatementClassOfStockAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain_2" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain_2" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="CommonClassAMember" xlink:title="CommonClassAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassAMember" xlink:title="definition: ClassOfStockDomain to CommonClassAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="CommonClassBMember" xlink:title="CommonClassBMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassBMember" xlink:title="definition: ClassOfStockDomain to CommonClassBMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/CondensedConsolidatedStatementsOfOperationsUnaudited">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="StatementLineItems" xlink:title="StatementLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SalesRevenueGoodsNet" xlink:label="SalesRevenueGoodsNet" xlink:title="SalesRevenueGoodsNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="SalesRevenueGoodsNet" xlink:title="definition: StatementLineItems to SalesRevenueGoodsNet" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingCostsAndExpensesAbstract" xlink:label="OperatingCostsAndExpensesAbstract" xlink:title="OperatingCostsAndExpensesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="OperatingCostsAndExpensesAbstract" xlink:title="definition: StatementLineItems to OperatingCostsAndExpensesAbstract" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="OperatingIncomeLoss" xlink:title="OperatingIncomeLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="OperatingIncomeLoss" xlink:title="definition: StatementLineItems to OperatingIncomeLoss" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment" xlink:label="CostmethodInvestmentsOtherThanTemporaryImpairment" xlink:title="CostmethodInvestmentsOtherThanTemporaryImpairment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="CostmethodInvestmentsOtherThanTemporaryImpairment" xlink:title="definition: StatementLineItems to CostmethodInvestmentsOtherThanTemporaryImpairment" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GainLossOnSaleOfInvestments" xlink:label="GainLossOnSaleOfInvestments" xlink:title="GainLossOnSaleOfInvestments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="GainLossOnSaleOfInvestments" xlink:title="definition: StatementLineItems to GainLossOnSaleOfInvestments" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherNonoperatingIncome" xlink:label="OtherNonoperatingIncome" xlink:title="OtherNonoperatingIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="OtherNonoperatingIncome" xlink:title="definition: StatementLineItems to OtherNonoperatingIncome" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:title="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:title="definition: StatementLineItems to IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="IncomeTaxExpenseBenefit" xlink:title="IncomeTaxExpenseBenefit" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="IncomeTaxExpenseBenefit" xlink:title="definition: StatementLineItems to IncomeTaxExpenseBenefit" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="NetIncomeLoss" xlink:title="NetIncomeLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="NetIncomeLoss" xlink:title="definition: StatementLineItems to NetIncomeLoss" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:label="EarningsPerShareBasicAndDilutedAbstract" xlink:title="EarningsPerShareBasicAndDilutedAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="EarningsPerShareBasicAndDilutedAbstract" xlink:title="definition: StatementLineItems to EarningsPerShareBasicAndDilutedAbstract" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="WeightedAverageNumberOfSharesOutstandingAbstract" xlink:title="WeightedAverageNumberOfSharesOutstandingAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="WeightedAverageNumberOfSharesOutstandingAbstract" xlink:title="definition: StatementLineItems to WeightedAverageNumberOfSharesOutstandingAbstract" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_DividendsPaidPerShareAbstract" xlink:label="DividendsPaidPerShareAbstract" xlink:title="DividendsPaidPerShareAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="DividendsPaidPerShareAbstract" xlink:title="definition: StatementLineItems to DividendsPaidPerShareAbstract" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockDividendsPerShareCashPaid" xlink:label="CommonStockDividendsPerShareCashPaid" xlink:title="CommonStockDividendsPerShareCashPaid" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="CommonStockDividendsPerShareCashPaid" xlink:title="definition: StatementLineItems to CommonStockDividendsPerShareCashPaid" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:title="WeightedAverageNumberOfShareOutstandingBasicAndDiluted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:title="definition: StatementLineItems to WeightedAverageNumberOfShareOutstandingBasicAndDiluted" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="EarningsPerShareBasicAndDiluted" xlink:title="EarningsPerShareBasicAndDiluted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="EarningsPerShareBasicAndDiluted" xlink:title="definition: StatementLineItems to EarningsPerShareBasicAndDiluted" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CostOfGoodsSold" xlink:label="CostOfGoodsSold" xlink:title="CostOfGoodsSold" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="CostOfGoodsSold" xlink:title="definition: StatementLineItems to CostOfGoodsSold" order="16.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="SellingGeneralAndAdministrativeExpense" xlink:title="SellingGeneralAndAdministrativeExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="SellingGeneralAndAdministrativeExpense" xlink:title="definition: StatementLineItems to SellingGeneralAndAdministrativeExpense" order="17.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="RestructuringCharges" xlink:title="RestructuringCharges" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="RestructuringCharges" xlink:title="definition: StatementLineItems to RestructuringCharges" order="18.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LitigationSettlementExpense" xlink:label="LitigationSettlementExpense" xlink:title="LitigationSettlementExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="LitigationSettlementExpense" xlink:title="definition: StatementLineItems to LitigationSettlementExpense" order="19.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="GainLossOnSaleOfPropertyPlantEquipment" xlink:title="GainLossOnSaleOfPropertyPlantEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="GainLossOnSaleOfPropertyPlantEquipment" xlink:title="definition: StatementLineItems to GainLossOnSaleOfPropertyPlantEquipment" order="20.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="CostsAndExpenses" xlink:title="CostsAndExpenses" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="CostsAndExpenses" xlink:title="definition: StatementLineItems to CostsAndExpenses" order="21.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="StatementTable" xlink:title="StatementTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="StatementLineItems" xlink:to="StatementTable" xlink:title="definition: StatementLineItems to StatementTable" order="22.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="StatementClassOfStockAxis" xlink:title="StatementClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="StatementTable" xlink:to="StatementClassOfStockAxis" xlink:title="definition: StatementTable to StatementClassOfStockAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain_2" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain_2" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="CommonClassAMember" xlink:title="CommonClassAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassAMember" xlink:title="definition: ClassOfStockDomain to CommonClassAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="CommonClassBMember" xlink:title="CommonClassBMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassBMember" xlink:title="definition: ClassOfStockDomain to CommonClassBMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/BasisOfPresentationAndAccountingPolicies" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/EarningsPerShare" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/Acquisitions" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/RestructuringActivities" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/FairValueMeasurements" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/Inventories" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/BusinessSegmentInformation" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/IncomeTaxes" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/AccruedExpenses" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/Debt" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/RetirementFundAndProfitSharingPlan" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/CommonStock" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/AccumulatedOtherComprehensiveLoss" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/LegalProceedings" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/RelatedPartyTransactions" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/SubsequentEvents" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/EarningsPerShareTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/AcquisitionsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/RestructuringActivitiesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/FairValueMeasurementsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/InventoriesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/BusinessSegmentInformationTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/AccruedExpensesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/RetirementFundAndProfitSharingPlanTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/AccumulatedOtherComprehensiveLossTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/EarningsPerShareDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareDilutedLineItems" xlink:label="EarningsPerShareDilutedLineItems" xlink:title="EarningsPerShareDilutedLineItems" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_ExcessiveDividendRateOfOneClassOverOtherClass" xlink:label="ExcessiveDividendRateOfOneClassOverOtherClass" xlink:title="ExcessiveDividendRateOfOneClassOverOtherClass" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="ExcessiveDividendRateOfOneClassOverOtherClass" xlink:title="definition: EarningsPerShareDilutedLineItems to ExcessiveDividendRateOfOneClassOverOtherClass" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_ExcessiveUndistributedEarningsAllocationRateOfOneClassOverOtherClass" xlink:label="ExcessiveUndistributedEarningsAllocationRateOfOneClassOverOtherClass" xlink:title="ExcessiveUndistributedEarningsAllocationRateOfOneClassOverOtherClass" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="ExcessiveUndistributedEarningsAllocationRateOfOneClassOverOtherClass" xlink:title="definition: EarningsPerShareDilutedLineItems to ExcessiveUndistributedEarningsAllocationRateOfOneClassOverOtherClass" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_EarningPerShareTwoClassMethodAbstract" xlink:label="EarningPerShareTwoClassMethodAbstract" xlink:title="EarningPerShareTwoClassMethodAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="EarningPerShareTwoClassMethodAbstract" xlink:title="definition: EarningsPerShareDilutedLineItems to EarningPerShareTwoClassMethodAbstract" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_NumeratorAbstract" xlink:label="NumeratorAbstract" xlink:title="NumeratorAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="NumeratorAbstract" xlink:title="definition: EarningsPerShareDilutedLineItems to NumeratorAbstract" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_UndistributedEarningsAllocationBasicAndDilutedAbstract" xlink:label="UndistributedEarningsAllocationBasicAndDilutedAbstract" xlink:title="UndistributedEarningsAllocationBasicAndDilutedAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="UndistributedEarningsAllocationBasicAndDilutedAbstract" xlink:title="definition: EarningsPerShareDilutedLineItems to UndistributedEarningsAllocationBasicAndDilutedAbstract" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_NetEarningsAllocationBasicAndDilutedAbstract" xlink:label="NetEarningsAllocationBasicAndDilutedAbstract" xlink:title="NetEarningsAllocationBasicAndDilutedAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="NetEarningsAllocationBasicAndDilutedAbstract" xlink:title="definition: EarningsPerShareDilutedLineItems to NetEarningsAllocationBasicAndDilutedAbstract" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_DenominatorAbstract" xlink:label="DenominatorAbstract" xlink:title="DenominatorAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="DenominatorAbstract" xlink:title="definition: EarningsPerShareDilutedLineItems to DenominatorAbstract" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="WeightedAverageNumberOfSharesOutstandingAbstract" xlink:title="WeightedAverageNumberOfSharesOutstandingAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="WeightedAverageNumberOfSharesOutstandingAbstract" xlink:title="definition: EarningsPerShareDilutedLineItems to WeightedAverageNumberOfSharesOutstandingAbstract" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:label="EarningsPerShareBasicAndDilutedAbstract" xlink:title="EarningsPerShareBasicAndDilutedAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="EarningsPerShareBasicAndDilutedAbstract" xlink:title="definition: EarningsPerShareDilutedLineItems to EarningsPerShareBasicAndDilutedAbstract" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="EarningsPerShareBasicAndDiluted" xlink:title="EarningsPerShareBasicAndDiluted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="EarningsPerShareBasicAndDiluted" xlink:title="definition: EarningsPerShareDilutedLineItems to EarningsPerShareBasicAndDiluted" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:title="WeightedAverageNumberOfShareOutstandingBasicAndDiluted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:title="definition: EarningsPerShareDilutedLineItems to WeightedAverageNumberOfShareOutstandingBasicAndDiluted" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="NetIncomeLoss" xlink:title="NetIncomeLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="NetIncomeLoss" xlink:title="definition: EarningsPerShareDilutedLineItems to NetIncomeLoss" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_UndistributedEarningsDiluted" xlink:label="UndistributedEarningsDiluted" xlink:title="UndistributedEarningsDiluted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="UndistributedEarningsDiluted" xlink:title="definition: EarningsPerShareDilutedLineItems to UndistributedEarningsDiluted" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Dividends" xlink:label="Dividends" xlink:title="Dividends" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="Dividends" xlink:title="definition: EarningsPerShareDilutedLineItems to Dividends" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_UndistributedEarnings" xlink:label="UndistributedEarnings" xlink:title="UndistributedEarnings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="UndistributedEarnings" xlink:title="definition: EarningsPerShareDilutedLineItems to UndistributedEarnings" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable" xlink:label="ScheduleOfEarningsPerShareDilutedByCommonClassTable" xlink:title="ScheduleOfEarningsPerShareDilutedByCommonClassTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="EarningsPerShareDilutedLineItems" xlink:to="ScheduleOfEarningsPerShareDilutedByCommonClassTable" xlink:title="definition: EarningsPerShareDilutedLineItems to ScheduleOfEarningsPerShareDilutedByCommonClassTable" order="16.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="StatementClassOfStockAxis" xlink:title="StatementClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfEarningsPerShareDilutedByCommonClassTable" xlink:to="StatementClassOfStockAxis" xlink:title="definition: ScheduleOfEarningsPerShareDilutedByCommonClassTable to StatementClassOfStockAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain_2" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain_2" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="CommonClassAMember" xlink:title="CommonClassAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassAMember" xlink:title="definition: ClassOfStockDomain to CommonClassAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="CommonClassBMember" xlink:title="CommonClassBMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassBMember" xlink:title="definition: ClassOfStockDomain to CommonClassBMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/AcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="BusinessAcquisitionLineItems" xlink:title="BusinessAcquisitionLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1" xlink:label="BusinessAcquisitionEffectiveDateOfAcquisition1" xlink:title="BusinessAcquisitionEffectiveDateOfAcquisition1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionEffectiveDateOfAcquisition1" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionEffectiveDateOfAcquisition1" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:title="BusinessAcquisitionPercentageOfVotingInterestsAcquired" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPercentageOfVotingInterestsAcquired" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid" xlink:label="BusinessAcquisitionCostOfAcquiredEntityCashPaid" xlink:title="BusinessAcquisitionCostOfAcquiredEntityCashPaid" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionCostOfAcquiredEntityCashPaid" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionCostOfAcquiredEntityCashPaid" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAcquiredFromAcquisition" xlink:label="CashAcquiredFromAcquisition" xlink:title="CashAcquiredFromAcquisition" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="CashAcquiredFromAcquisition" xlink:title="definition: BusinessAcquisitionLineItems to CashAcquiredFromAcquisition" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_NumberOfRestrictedSharesGrantedForAcquisition" xlink:label="NumberOfRestrictedSharesGrantedForAcquisition" xlink:title="NumberOfRestrictedSharesGrantedForAcquisition" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="NumberOfRestrictedSharesGrantedForAcquisition" xlink:title="definition: BusinessAcquisitionLineItems to NumberOfRestrictedSharesGrantedForAcquisition" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_RestrictedStockIssuedInConnectionWithAcquisitionFairValue" xlink:label="RestrictedStockIssuedInConnectionWithAcquisitionFairValue" xlink:title="RestrictedStockIssuedInConnectionWithAcquisitionFairValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="RestrictedStockIssuedInConnectionWithAcquisitionFairValue" xlink:title="definition: BusinessAcquisitionLineItems to RestrictedStockIssuedInConnectionWithAcquisitionFairValue" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="BusinessCombinationAcquisitionRelatedCosts" xlink:title="BusinessCombinationAcquisitionRelatedCosts" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessCombinationAcquisitionRelatedCosts" xlink:title="definition: BusinessAcquisitionLineItems to BusinessCombinationAcquisitionRelatedCosts" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_AssetsAcquiredAbstract" xlink:label="AssetsAcquiredAbstract" xlink:title="AssetsAcquiredAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="AssetsAcquiredAbstract" xlink:title="definition: BusinessAcquisitionLineItems to AssetsAcquiredAbstract" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_LiabilitiesAssumedAbstract" xlink:label="LiabilitiesAssumedAbstract" xlink:title="LiabilitiesAssumedAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="LiabilitiesAssumedAbstract" xlink:title="definition: BusinessAcquisitionLineItems to LiabilitiesAssumedAbstract" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:title="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:title="definition: BusinessAcquisitionLineItems to BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:label="BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:title="BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet" xlink:label="BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet" xlink:title="BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredAbstract" xlink:label="BusinessCombinationConsiderationTransferredAbstract" xlink:title="BusinessCombinationConsiderationTransferredAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessCombinationConsiderationTransferredAbstract" xlink:title="definition: BusinessAcquisitionLineItems to BusinessCombinationConsiderationTransferredAbstract" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Revenues" xlink:label="Revenues" xlink:title="Revenues" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="Revenues" xlink:title="definition: BusinessAcquisitionLineItems to Revenues" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_NetIncomeLossContributedByAcquiredEntities" xlink:label="NetIncomeLossContributedByAcquiredEntities" xlink:title="NetIncomeLossContributedByAcquiredEntities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="NetIncomeLossContributedByAcquiredEntities" xlink:title="definition: BusinessAcquisitionLineItems to NetIncomeLossContributedByAcquiredEntities" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationAbstract" xlink:label="BusinessAcquisitionProFormaInformationAbstract" xlink:title="BusinessAcquisitionProFormaInformationAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionProFormaInformationAbstract" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionProFormaInformationAbstract" order="16.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="BusinessAcquisitionsProFormaRevenue" xlink:title="BusinessAcquisitionsProFormaRevenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionsProFormaRevenue" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionsProFormaRevenue" order="17.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="BusinessAcquisitionsProFormaNetIncomeLoss" xlink:title="BusinessAcquisitionsProFormaNetIncomeLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionsProFormaNetIncomeLoss" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionsProFormaNetIncomeLoss" order="18.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted" xlink:label="BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted" xlink:title="BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted" order="19.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionContingentConsiderationAtFairValue" xlink:label="BusinessAcquisitionContingentConsiderationAtFairValue" xlink:title="BusinessAcquisitionContingentConsiderationAtFairValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionContingentConsiderationAtFairValue" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionContingentConsiderationAtFairValue" order="20.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred" xlink:label="BusinessCombinationConsiderationTransferred" xlink:title="BusinessCombinationConsiderationTransferred" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessCombinationConsiderationTransferred" xlink:title="definition: BusinessAcquisitionLineItems to BusinessCombinationConsiderationTransferred" order="21.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayable" order="22.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccruedLiabilities" order="23.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationNotesPayableAndLongTermDebt" xlink:label="BusinessAcquisitionPurchasePriceAllocationNotesPayableAndLongTermDebt" xlink:title="BusinessAcquisitionPurchasePriceAllocationNotesPayableAndLongTermDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationNotesPayableAndLongTermDebt" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationNotesPayableAndLongTermDebt" order="24.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_BusinessAcquisitionPurchasePriceAllocationIncomeTaxesPayable" xlink:label="BusinessAcquisitionPurchasePriceAllocationIncomeTaxesPayable" xlink:title="BusinessAcquisitionPurchasePriceAllocationIncomeTaxesPayable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationIncomeTaxesPayable" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationIncomeTaxesPayable" order="25.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrent" xlink:label="BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrent" xlink:title="BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrent" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiabilitiesCurrent" order="26.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilities" xlink:label="BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilities" xlink:title="BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilities" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilities" order="27.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed" xlink:label="BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed" xlink:title="BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed" order="28.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents" order="29.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" order="30.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentAssetsInventory" order="31.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:label="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:title="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpenseAndOtherAssets" order="32.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" xlink:label="BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" xlink:title="BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" order="33.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsNotAmortizable" xlink:label="BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsNotAmortizable" xlink:title="BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsNotAmortizable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsNotAmortizable" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsNotAmortizable" order="34.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired" xlink:label="BusinessAcquisitionPurchasePriceAllocationAssetsAcquired" xlink:title="BusinessAcquisitionPurchasePriceAllocationAssetsAcquired" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationAssetsAcquired" xlink:title="definition: BusinessAcquisitionLineItems to BusinessAcquisitionPurchasePriceAllocationAssetsAcquired" order="35.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:title="ScheduleOfBusinessAcquisitionsByAcquisitionTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="BusinessAcquisitionLineItems" xlink:to="ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:title="definition: BusinessAcquisitionLineItems to ScheduleOfBusinessAcquisitionsByAcquisitionTable" order="36.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="BusinessAcquisitionAxis" xlink:title="BusinessAcquisitionAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="BusinessAcquisitionAxis" xlink:title="definition: ScheduleOfBusinessAcquisitionsByAcquisitionTable to BusinessAcquisitionAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="BusinessAcquisitionAcquireeDomain" xlink:title="BusinessAcquisitionAcquireeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="BusinessAcquisitionAxis" xlink:to="BusinessAcquisitionAcquireeDomain" xlink:title="definition: BusinessAcquisitionAxis to BusinessAcquisitionAcquireeDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="BusinessAcquisitionAcquireeDomain_2" xlink:title="BusinessAcquisitionAcquireeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="BusinessAcquisitionAxis" xlink:to="BusinessAcquisitionAcquireeDomain_2" xlink:title="definition: BusinessAcquisitionAxis to BusinessAcquisitionAcquireeDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_GigacomInterconnectMember" xlink:label="GigacomInterconnectMember" xlink:title="GigacomInterconnectMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="GigacomInterconnectMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to GigacomInterconnectMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_FibrecoMember" xlink:label="FibrecoMember" xlink:title="FibrecoMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="FibrecoMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to FibrecoMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_PowerboxItalyMember" xlink:label="PowerboxItalyMember" xlink:title="PowerboxItalyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="PowerboxItalyMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to PowerboxItalyMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" xlink:label="SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" xlink:title="SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="StatementGeographicalAxis" xlink:title="StatementGeographicalAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="StatementGeographicalAxis" xlink:title="definition: ScheduleOfBusinessAcquisitionsByAcquisitionTable to StatementGeographicalAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain_2" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain_2" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_NorthAmericaMember" xlink:label="NorthAmericaMember" xlink:title="NorthAmericaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="NorthAmericaMember" xlink:title="definition: SegmentGeographicalDomain to NorthAmericaMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalGroupsOfCountriesGroupTwoMember" xlink:label="SegmentGeographicalGroupsOfCountriesGroupTwoMember" xlink:title="SegmentGeographicalGroupsOfCountriesGroupTwoMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="SegmentGeographicalGroupsOfCountriesGroupTwoMember" xlink:title="definition: SegmentGeographicalDomain to SegmentGeographicalGroupsOfCountriesGroupTwoMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="StatementClassOfStockAxis" xlink:title="StatementClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="StatementClassOfStockAxis" xlink:title="definition: ScheduleOfBusinessAcquisitionsByAcquisitionTable to StatementClassOfStockAxis" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain_2" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain_2" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="CommonClassAMember" xlink:title="CommonClassAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassAMember" xlink:title="definition: ClassOfStockDomain to CommonClassAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="CommonClassBMember" xlink:title="CommonClassBMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassBMember" xlink:title="definition: ClassOfStockDomain to CommonClassBMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="StatementScenarioAxis" xlink:title="StatementScenarioAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="StatementScenarioAxis" xlink:title="definition: ScheduleOfBusinessAcquisitionsByAcquisitionTable to StatementScenarioAxis" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="ScenarioUnspecifiedDomain" xlink:title="ScenarioUnspecifiedDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementScenarioAxis" xlink:to="ScenarioUnspecifiedDomain" xlink:title="definition: StatementScenarioAxis to ScenarioUnspecifiedDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="ScenarioUnspecifiedDomain_2" xlink:title="ScenarioUnspecifiedDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementScenarioAxis" xlink:to="ScenarioUnspecifiedDomain_2" xlink:title="definition: StatementScenarioAxis to ScenarioUnspecifiedDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioPreviouslyReportedMember" xlink:label="ScenarioPreviouslyReportedMember" xlink:title="ScenarioPreviouslyReportedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ScenarioUnspecifiedDomain" xlink:to="ScenarioPreviouslyReportedMember" xlink:title="definition: ScenarioUnspecifiedDomain to ScenarioPreviouslyReportedMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioAdjustmentMember" xlink:label="ScenarioAdjustmentMember" xlink:title="ScenarioAdjustmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ScenarioUnspecifiedDomain" xlink:to="ScenarioAdjustmentMember" xlink:title="definition: ScenarioUnspecifiedDomain to ScenarioAdjustmentMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioActualMember" xlink:label="ScenarioActualMember" xlink:title="ScenarioActualMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ScenarioUnspecifiedDomain" xlink:to="ScenarioActualMember" xlink:title="definition: ScenarioUnspecifiedDomain to ScenarioActualMember" order="3.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/RestructuringActivitiesDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="RestructuringCostAndReserveLineItems" xlink:title="RestructuringCostAndReserveLineItems" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_FacilityLeaseCommitment" xlink:label="FacilityLeaseCommitment" xlink:title="FacilityLeaseCommitment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RestructuringCostAndReserveLineItems" xlink:to="FacilityLeaseCommitment" xlink:title="definition: RestructuringCostAndReserveLineItems to FacilityLeaseCommitment" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringReserveRollForward" xlink:label="RestructuringReserveRollForward" xlink:title="RestructuringReserveRollForward" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RestructuringCostAndReserveLineItems" xlink:to="RestructuringReserveRollForward" xlink:title="definition: RestructuringCostAndReserveLineItems to RestructuringReserveRollForward" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringReserveCurrent" xlink:label="RestructuringReserveCurrent" xlink:title="RestructuringReserveCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RestructuringCostAndReserveLineItems" xlink:to="RestructuringReserveCurrent" xlink:title="definition: RestructuringCostAndReserveLineItems to RestructuringReserveCurrent" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="RestructuringReserve" xlink:title="RestructuringReserve" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RestructuringCostAndReserveLineItems" xlink:to="RestructuringReserve" xlink:title="definition: RestructuringCostAndReserveLineItems to RestructuringReserve" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="RestructuringCharges" xlink:title="RestructuringCharges" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RestructuringCostAndReserveLineItems" xlink:to="RestructuringCharges" xlink:title="definition: RestructuringCostAndReserveLineItems to RestructuringCharges" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_RestructuringCashPaymentsAndOtherSettlements" xlink:label="RestructuringCashPaymentsAndOtherSettlements" xlink:title="RestructuringCashPaymentsAndOtherSettlements" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RestructuringCostAndReserveLineItems" xlink:to="RestructuringCashPaymentsAndOtherSettlements" xlink:title="definition: RestructuringCostAndReserveLineItems to RestructuringCashPaymentsAndOtherSettlements" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="ScheduleOfRestructuringAndRelatedCostsTable" xlink:title="ScheduleOfRestructuringAndRelatedCostsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="RestructuringCostAndReserveLineItems" xlink:to="ScheduleOfRestructuringAndRelatedCostsTable" xlink:title="definition: RestructuringCostAndReserveLineItems to ScheduleOfRestructuringAndRelatedCostsTable" order="7.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="RestructuringCostAndReserveAxis" xlink:title="RestructuringCostAndReserveAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfRestructuringAndRelatedCostsTable" xlink:to="RestructuringCostAndReserveAxis" xlink:title="definition: ScheduleOfRestructuringAndRelatedCostsTable to RestructuringCostAndReserveAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="TypeOfRestructuringDomain" xlink:title="TypeOfRestructuringDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="RestructuringCostAndReserveAxis" xlink:to="TypeOfRestructuringDomain" xlink:title="definition: RestructuringCostAndReserveAxis to TypeOfRestructuringDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="TypeOfRestructuringDomain_2" xlink:title="TypeOfRestructuringDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="RestructuringCostAndReserveAxis" xlink:to="TypeOfRestructuringDomain_2" xlink:title="definition: RestructuringCostAndReserveAxis to TypeOfRestructuringDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="EmployeeSeveranceMember" xlink:title="EmployeeSeveranceMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="TypeOfRestructuringDomain" xlink:to="EmployeeSeveranceMember" xlink:title="definition: TypeOfRestructuringDomain to EmployeeSeveranceMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_TransportationOfEquipmentMember" xlink:label="TransportationOfEquipmentMember" xlink:title="TransportationOfEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="TypeOfRestructuringDomain" xlink:to="TransportationOfEquipmentMember" xlink:title="definition: TypeOfRestructuringDomain to TransportationOfEquipmentMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_SetupCostsMember" xlink:label="SetupCostsMember" xlink:title="SetupCostsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="TypeOfRestructuringDomain" xlink:to="SetupCostsMember" xlink:title="definition: TypeOfRestructuringDomain to SetupCostsMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherRestructuringMember" xlink:label="OtherRestructuringMember" xlink:title="OtherRestructuringMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="TypeOfRestructuringDomain" xlink:to="OtherRestructuringMember" xlink:title="definition: TypeOfRestructuringDomain to OtherRestructuringMember" order="4.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/FairValueMeasurementsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:title="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AvailableForSaleSecuritiesFairValueDisclosure" xlink:label="AvailableForSaleSecuritiesFairValueDisclosure" xlink:title="AvailableForSaleSecuritiesFairValueDisclosure" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="AvailableForSaleSecuritiesFairValueDisclosure" xlink:title="definition: FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems to AvailableForSaleSecuritiesFairValueDisclosure" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLosses1" xlink:label="AvailableForSaleSecuritiesGrossUnrealizedLosses1" xlink:title="AvailableForSaleSecuritiesGrossUnrealizedLosses1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="AvailableForSaleSecuritiesGrossUnrealizedLosses1" xlink:title="definition: FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems to AvailableForSaleSecuritiesGrossUnrealizedLosses1" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment" xlink:label="CostmethodInvestmentsOtherThanTemporaryImpairment" xlink:title="CostmethodInvestmentsOtherThanTemporaryImpairment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="CostmethodInvestmentsOtherThanTemporaryImpairment" xlink:title="definition: FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems to CostmethodInvestmentsOtherThanTemporaryImpairment" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_TransfersInOutBetweenLevels" xlink:label="TransfersInOutBetweenLevels" xlink:title="TransfersInOutBetweenLevels" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="TransfersInOutBetweenLevels" xlink:title="definition: FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems to TransfersInOutBetweenLevels" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="AssetsFairValueDisclosureAbstract" xlink:title="AssetsFairValueDisclosureAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="AssetsFairValueDisclosureAbstract" xlink:title="definition: FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems to AssetsFairValueDisclosureAbstract" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:title="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:title="definition: FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems to FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" order="6.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:title="MajorTypesOfDebtAndEquitySecuritiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:title="definition: FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable to MajorTypesOfDebtAndEquitySecuritiesAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:title="MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:title="definition: MajorTypesOfDebtAndEquitySecuritiesAxis to MajorTypesOfDebtAndEquitySecuritiesDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="MajorTypesOfDebtAndEquitySecuritiesDomain_2" xlink:title="MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="MajorTypesOfDebtAndEquitySecuritiesDomain_2" xlink:title="definition: MajorTypesOfDebtAndEquitySecuritiesAxis to MajorTypesOfDebtAndEquitySecuritiesDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_InvestmentsHeldInRabbiTrustMember" xlink:label="InvestmentsHeldInRabbiTrustMember" xlink:title="InvestmentsHeldInRabbiTrustMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="InvestmentsHeldInRabbiTrustMember" xlink:title="definition: MajorTypesOfDebtAndEquitySecuritiesDomain to InvestmentsHeldInRabbiTrustMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="EquitySecuritiesMember" xlink:title="EquitySecuritiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="EquitySecuritiesMember" xlink:title="definition: MajorTypesOfDebtAndEquitySecuritiesDomain to EquitySecuritiesMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FixedIncomeSecuritiesMember" xlink:label="FixedIncomeSecuritiesMember" xlink:title="FixedIncomeSecuritiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="FixedIncomeSecuritiesMember" xlink:title="definition: MajorTypesOfDebtAndEquitySecuritiesDomain to FixedIncomeSecuritiesMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecuritiesAssetsMember" xlink:label="SecuritiesAssetsMember" xlink:title="SecuritiesAssetsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="SecuritiesAssetsMember" xlink:title="definition: MajorTypesOfDebtAndEquitySecuritiesDomain to SecuritiesAssetsMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="FairValueByMeasurementFrequencyAxis" xlink:title="FairValueByMeasurementFrequencyAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="FairValueByMeasurementFrequencyAxis" xlink:title="definition: FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable to FairValueByMeasurementFrequencyAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="FairValueMeasurementFrequencyDomain" xlink:title="FairValueMeasurementFrequencyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="FairValueByMeasurementFrequencyAxis" xlink:to="FairValueMeasurementFrequencyDomain" xlink:title="definition: FairValueByMeasurementFrequencyAxis to FairValueMeasurementFrequencyDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="FairValueMeasurementFrequencyDomain_2" xlink:title="FairValueMeasurementFrequencyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="FairValueByMeasurementFrequencyAxis" xlink:to="FairValueMeasurementFrequencyDomain_2" xlink:title="definition: FairValueByMeasurementFrequencyAxis to FairValueMeasurementFrequencyDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="FairValueMeasurementsRecurringMember" xlink:title="FairValueMeasurementsRecurringMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FairValueMeasurementFrequencyDomain" xlink:to="FairValueMeasurementsRecurringMember" xlink:title="definition: FairValueMeasurementFrequencyDomain to FairValueMeasurementsRecurringMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="FairValueByFairValueHierarchyLevelAxis" xlink:title="FairValueByFairValueHierarchyLevelAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="FairValueByFairValueHierarchyLevelAxis" xlink:title="definition: FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable to FairValueByFairValueHierarchyLevelAxis" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="FairValueMeasurementsFairValueHierarchyDomain" xlink:title="FairValueMeasurementsFairValueHierarchyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="FairValueByFairValueHierarchyLevelAxis" xlink:to="FairValueMeasurementsFairValueHierarchyDomain" xlink:title="definition: FairValueByFairValueHierarchyLevelAxis to FairValueMeasurementsFairValueHierarchyDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="FairValueMeasurementsFairValueHierarchyDomain_2" xlink:title="FairValueMeasurementsFairValueHierarchyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="FairValueByFairValueHierarchyLevelAxis" xlink:to="FairValueMeasurementsFairValueHierarchyDomain_2" xlink:title="definition: FairValueByFairValueHierarchyLevelAxis to FairValueMeasurementsFairValueHierarchyDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="FairValueInputsLevel1Member" xlink:title="FairValueInputsLevel1Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FairValueMeasurementsFairValueHierarchyDomain" xlink:to="FairValueInputsLevel1Member" xlink:title="definition: FairValueMeasurementsFairValueHierarchyDomain to FairValueInputsLevel1Member" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="FairValueInputsLevel2Member" xlink:title="FairValueInputsLevel2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FairValueMeasurementsFairValueHierarchyDomain" xlink:to="FairValueInputsLevel2Member" xlink:title="definition: FairValueMeasurementsFairValueHierarchyDomain to FairValueInputsLevel2Member" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="FairValueInputsLevel3Member" xlink:title="FairValueInputsLevel3Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FairValueMeasurementsFairValueHierarchyDomain" xlink:to="FairValueInputsLevel3Member" xlink:title="definition: FairValueMeasurementsFairValueHierarchyDomain to FairValueInputsLevel3Member" order="3.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/InventoriesDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/BusinessSegmentInformationDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="SegmentReportingInformationLineItems" xlink:title="SegmentReportingInformationLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract" xlink:label="ReconciliationFromSegmentTotalsToConsolidatedAbstract" xlink:title="ReconciliationFromSegmentTotalsToConsolidatedAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="ReconciliationFromSegmentTotalsToConsolidatedAbstract" xlink:title="definition: SegmentReportingInformationLineItems to ReconciliationFromSegmentTotalsToConsolidatedAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingInformationRevenueAbstract" xlink:label="SegmentReportingInformationRevenueAbstract" xlink:title="SegmentReportingInformationRevenueAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="SegmentReportingInformationRevenueAbstract" xlink:title="definition: SegmentReportingInformationLineItems to SegmentReportingInformationRevenueAbstract" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_ReconcilingItemAbstract" xlink:label="ReconcilingItemAbstract" xlink:title="ReconcilingItemAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="ReconcilingItemAbstract" xlink:title="definition: SegmentReportingInformationLineItems to ReconcilingItemAbstract" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SalesRevenueGoodsNet" xlink:label="SalesRevenueGoodsNet" xlink:title="SalesRevenueGoodsNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="SalesRevenueGoodsNet" xlink:title="definition: SegmentReportingInformationLineItems to SalesRevenueGoodsNet" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract" xlink:label="ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract" xlink:title="ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract" xlink:title="definition: SegmentReportingInformationLineItems to ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="OperatingIncomeLoss" xlink:title="OperatingIncomeLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="OperatingIncomeLoss" xlink:title="definition: SegmentReportingInformationLineItems to OperatingIncomeLoss" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" xlink:label="RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" xlink:title="RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" xlink:title="definition: SegmentReportingInformationLineItems to RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingInformationRevenue" xlink:label="SegmentReportingInformationRevenue" xlink:title="SegmentReportingInformationRevenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentReportingInformationLineItems" xlink:to="SegmentReportingInformationRevenue" xlink:title="definition: SegmentReportingInformationLineItems to SegmentReportingInformationRevenue" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="ScheduleOfSegmentReportingInformationBySegmentTable" xlink:title="ScheduleOfSegmentReportingInformationBySegmentTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="SegmentReportingInformationLineItems" xlink:to="ScheduleOfSegmentReportingInformationBySegmentTable" xlink:title="definition: SegmentReportingInformationLineItems to ScheduleOfSegmentReportingInformationBySegmentTable" order="9.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="StatementGeographicalAxis" xlink:title="StatementGeographicalAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="StatementGeographicalAxis" xlink:title="definition: ScheduleOfSegmentReportingInformationBySegmentTable to StatementGeographicalAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain_2" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain_2" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_NorthAmericaMember" xlink:label="NorthAmericaMember" xlink:title="NorthAmericaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="NorthAmericaMember" xlink:title="definition: SegmentGeographicalDomain to NorthAmericaMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalGroupsOfCountriesGroupOneMember" xlink:label="SegmentGeographicalGroupsOfCountriesGroupOneMember" xlink:title="SegmentGeographicalGroupsOfCountriesGroupOneMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="SegmentGeographicalGroupsOfCountriesGroupOneMember" xlink:title="definition: SegmentGeographicalDomain to SegmentGeographicalGroupsOfCountriesGroupOneMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalGroupsOfCountriesGroupTwoMember" xlink:label="SegmentGeographicalGroupsOfCountriesGroupTwoMember" xlink:title="SegmentGeographicalGroupsOfCountriesGroupTwoMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="SegmentGeographicalGroupsOfCountriesGroupTwoMember" xlink:title="definition: SegmentGeographicalDomain to SegmentGeographicalGroupsOfCountriesGroupTwoMember" order="3.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/IncomeTaxesDetails">
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_TaxAssetsAndLiabilitiesAcquiredLineItems" xlink:label="TaxAssetsAndLiabilitiesAcquiredLineItems" xlink:title="TaxAssetsAndLiabilitiesAcquiredLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet" xlink:label="BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet" xlink:title="BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="TaxAssetsAndLiabilitiesAcquiredLineItems" xlink:to="BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet" xlink:title="definition: TaxAssetsAndLiabilitiesAcquiredLineItems to BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibles" xlink:label="DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibles" xlink:title="DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibles" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="TaxAssetsAndLiabilitiesAcquiredLineItems" xlink:to="DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibles" xlink:title="definition: TaxAssetsAndLiabilitiesAcquiredLineItems to DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibles" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_AcquiredTaxAssetsAndLiabilitiesTable" xlink:label="AcquiredTaxAssetsAndLiabilitiesTable" xlink:title="AcquiredTaxAssetsAndLiabilitiesTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="TaxAssetsAndLiabilitiesAcquiredLineItems" xlink:to="AcquiredTaxAssetsAndLiabilitiesTable" xlink:title="definition: TaxAssetsAndLiabilitiesAcquiredLineItems to AcquiredTaxAssetsAndLiabilitiesTable" order="3.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="BusinessAcquisitionAxis" xlink:title="BusinessAcquisitionAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="AcquiredTaxAssetsAndLiabilitiesTable" xlink:to="BusinessAcquisitionAxis" xlink:title="definition: AcquiredTaxAssetsAndLiabilitiesTable to BusinessAcquisitionAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="BusinessAcquisitionAcquireeDomain" xlink:title="BusinessAcquisitionAcquireeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="BusinessAcquisitionAxis" xlink:to="BusinessAcquisitionAcquireeDomain" xlink:title="definition: BusinessAcquisitionAxis to BusinessAcquisitionAcquireeDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="BusinessAcquisitionAcquireeDomain_2" xlink:title="BusinessAcquisitionAcquireeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="BusinessAcquisitionAxis" xlink:to="BusinessAcquisitionAcquireeDomain_2" xlink:title="definition: BusinessAcquisitionAxis to BusinessAcquisitionAcquireeDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" xlink:label="SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" xlink:title="SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BusinessAcquisitionAcquireeDomain" xlink:to="SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" xlink:title="definition: BusinessAcquisitionAcquireeDomain to SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxExaminationLineItems" xlink:label="IncomeTaxExaminationLineItems" xlink:title="IncomeTaxExaminationLineItems" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_IncomeTaxExaminationYearsNotSubjectToExamination" xlink:label="IncomeTaxExaminationYearsNotSubjectToExamination" xlink:title="IncomeTaxExaminationYearsNotSubjectToExamination" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IncomeTaxExaminationLineItems" xlink:to="IncomeTaxExaminationYearsNotSubjectToExamination" xlink:title="definition: IncomeTaxExaminationLineItems to IncomeTaxExaminationYearsNotSubjectToExamination" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_IncomeTaxExaminationsYearUnderExamination" xlink:label="IncomeTaxExaminationsYearUnderExamination" xlink:title="IncomeTaxExaminationsYearUnderExamination" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IncomeTaxExaminationLineItems" xlink:to="IncomeTaxExaminationsYearUnderExamination" xlink:title="definition: IncomeTaxExaminationLineItems to IncomeTaxExaminationsYearUnderExamination" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority" xlink:label="IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority" xlink:title="IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IncomeTaxExaminationLineItems" xlink:to="IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority" xlink:title="definition: IncomeTaxExaminationLineItems to IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_IncomeTaxAuditYearsUnderExamination" xlink:label="IncomeTaxAuditYearsUnderExamination" xlink:title="IncomeTaxAuditYearsUnderExamination" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IncomeTaxExaminationLineItems" xlink:to="IncomeTaxAuditYearsUnderExamination" xlink:title="definition: IncomeTaxExaminationLineItems to IncomeTaxAuditYearsUnderExamination" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxExaminationTable" xlink:label="IncomeTaxExaminationTable" xlink:title="IncomeTaxExaminationTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="IncomeTaxExaminationLineItems" xlink:to="IncomeTaxExaminationTable" xlink:title="definition: IncomeTaxExaminationLineItems to IncomeTaxExaminationTable" order="5.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="IncomeTaxAuthorityAxis" xlink:title="IncomeTaxAuthorityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="IncomeTaxExaminationTable" xlink:to="IncomeTaxAuthorityAxis" xlink:title="definition: IncomeTaxExaminationTable to IncomeTaxAuthorityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="IncomeTaxAuthorityDomain" xlink:title="IncomeTaxAuthorityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="IncomeTaxAuthorityAxis" xlink:to="IncomeTaxAuthorityDomain" xlink:title="definition: IncomeTaxAuthorityAxis to IncomeTaxAuthorityDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="IncomeTaxAuthorityDomain_2" xlink:title="IncomeTaxAuthorityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="IncomeTaxAuthorityAxis" xlink:to="IncomeTaxAuthorityDomain_2" xlink:title="definition: IncomeTaxAuthorityAxis to IncomeTaxAuthorityDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="DomesticCountryMember" xlink:title="DomesticCountryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IncomeTaxAuthorityDomain" xlink:to="DomesticCountryMember" xlink:title="definition: IncomeTaxAuthorityDomain to DomesticCountryMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember" xlink:label="StateAndLocalJurisdictionMember" xlink:title="StateAndLocalJurisdictionMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IncomeTaxAuthorityDomain" xlink:to="StateAndLocalJurisdictionMember" xlink:title="definition: IncomeTaxAuthorityDomain to StateAndLocalJurisdictionMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ForeignCountryMember" xlink:label="ForeignCountryMember" xlink:title="ForeignCountryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IncomeTaxAuthorityDomain" xlink:to="ForeignCountryMember" xlink:title="definition: IncomeTaxAuthorityDomain to ForeignCountryMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="StatementGeographicalAxis" xlink:title="StatementGeographicalAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="IncomeTaxExaminationTable" xlink:to="StatementGeographicalAxis" xlink:title="definition: IncomeTaxExaminationTable to StatementGeographicalAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain_2" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain_2" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalGroupsOfCountriesGroupOneMember" xlink:label="SegmentGeographicalGroupsOfCountriesGroupOneMember" xlink:title="SegmentGeographicalGroupsOfCountriesGroupOneMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="SegmentGeographicalGroupsOfCountriesGroupOneMember" xlink:title="definition: SegmentGeographicalDomain to SegmentGeographicalGroupsOfCountriesGroupOneMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalGroupsOfCountriesGroupTwoMember" xlink:label="SegmentGeographicalGroupsOfCountriesGroupTwoMember" xlink:title="SegmentGeographicalGroupsOfCountriesGroupTwoMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="SegmentGeographicalGroupsOfCountriesGroupTwoMember" xlink:title="definition: SegmentGeographicalDomain to SegmentGeographicalGroupsOfCountriesGroupTwoMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_GermanyMember" xlink:label="GermanyMember" xlink:title="GermanyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="GermanyMember" xlink:title="definition: SegmentGeographicalDomain to GermanyMember" order="3.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/AccruedExpensesDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/DebtDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="LineOfCreditFacilityLineItems" xlink:title="LineOfCreditFacilityLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="LineOfCreditFacilityCurrentBorrowingCapacity" xlink:title="LineOfCreditFacilityCurrentBorrowingCapacity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LineOfCreditFacilityLineItems" xlink:to="LineOfCreditFacilityCurrentBorrowingCapacity" xlink:title="definition: LineOfCreditFacilityLineItems to LineOfCreditFacilityCurrentBorrowingCapacity" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="DebtInstrumentMaturityDate" xlink:title="DebtInstrumentMaturityDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LineOfCreditFacilityLineItems" xlink:to="DebtInstrumentMaturityDate" xlink:title="definition: LineOfCreditFacilityLineItems to DebtInstrumentMaturityDate" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityCollateral" xlink:label="LineOfCreditFacilityCollateral" xlink:title="LineOfCreditFacilityCollateral" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LineOfCreditFacilityLineItems" xlink:to="LineOfCreditFacilityCollateral" xlink:title="definition: LineOfCreditFacilityLineItems to LineOfCreditFacilityCollateral" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="LineOfCreditFacilityAmountOutstanding" xlink:title="LineOfCreditFacilityAmountOutstanding" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LineOfCreditFacilityLineItems" xlink:to="LineOfCreditFacilityAmountOutstanding" xlink:title="definition: LineOfCreditFacilityLineItems to LineOfCreditFacilityAmountOutstanding" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateDescription" xlink:label="LineOfCreditFacilityInterestRateDescription" xlink:title="LineOfCreditFacilityInterestRateDescription" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LineOfCreditFacilityLineItems" xlink:to="LineOfCreditFacilityInterestRateDescription" xlink:title="definition: LineOfCreditFacilityLineItems to LineOfCreditFacilityInterestRateDescription" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="LineOfCreditFacilityTable" xlink:title="LineOfCreditFacilityTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="LineOfCreditFacilityLineItems" xlink:to="LineOfCreditFacilityTable" xlink:title="definition: LineOfCreditFacilityLineItems to LineOfCreditFacilityTable" order="6.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="CreditFacilityAxis" xlink:title="CreditFacilityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="LineOfCreditFacilityTable" xlink:to="CreditFacilityAxis" xlink:title="definition: LineOfCreditFacilityTable to CreditFacilityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="CreditFacilityDomain" xlink:title="CreditFacilityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="CreditFacilityAxis" xlink:to="CreditFacilityDomain" xlink:title="definition: CreditFacilityAxis to CreditFacilityDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="CreditFacilityDomain_2" xlink:title="CreditFacilityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="CreditFacilityAxis" xlink:to="CreditFacilityDomain_2" xlink:title="definition: CreditFacilityAxis to CreditFacilityDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="LineOfCreditMember" xlink:title="LineOfCreditMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditFacilityDomain" xlink:to="LineOfCreditMember" xlink:title="definition: CreditFacilityDomain to LineOfCreditMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/RetirementFundAndProfitSharingPlanDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:label="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:title="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitExpense" xlink:label="PensionAndOtherPostretirementBenefitExpense" xlink:title="PensionAndOtherPostretirementBenefitExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="PensionAndOtherPostretirementBenefitExpense" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to PensionAndOtherPostretirementBenefitExpense" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_SharesHeldInPlan" xlink:label="SharesHeldInPlan" xlink:title="SharesHeldInPlan" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="SharesHeldInPlan" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to SharesHeldInPlan" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:label="DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:title="DefinedBenefitPlanNetPeriodicBenefitCostAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanNetPeriodicBenefitCostAbstract" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="DefinedBenefitPlanServiceCost" xlink:title="DefinedBenefitPlanServiceCost" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanServiceCost" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanServiceCost" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="DefinedBenefitPlanInterestCost" xlink:title="DefinedBenefitPlanInterestCost" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanInterestCost" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanInterestCost" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanOtherCosts" xlink:label="DefinedBenefitPlanOtherCosts" xlink:title="DefinedBenefitPlanOtherCosts" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanOtherCosts" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanOtherCosts" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="DefinedBenefitPlanNetPeriodicBenefitCost" xlink:title="DefinedBenefitPlanNetPeriodicBenefitCost" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanNetPeriodicBenefitCost" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanNetPeriodicBenefitCost" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" xlink:label="DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" xlink:title="DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" xlink:label="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" xlink:title="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" xlink:label="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" xlink:title="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" xlink:label="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" xlink:title="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" xlink:label="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" xlink:title="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:title="PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:title="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:title="definition: DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems to ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" order="14.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="AwardTypeAxis" xlink:title="AwardTypeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="AwardTypeAxis" xlink:title="definition: ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable to AwardTypeAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:title="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="AwardTypeAxis" xlink:to="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:title="definition: AwardTypeAxis to ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2" xlink:title="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="AwardTypeAxis" xlink:to="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2" xlink:title="definition: AwardTypeAxis to ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockCompensationPlanMember" xlink:label="StockCompensationPlanMember" xlink:title="StockCompensationPlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="StockCompensationPlanMember" xlink:title="definition: ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to StockCompensationPlanMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedContributionPensionMember" xlink:label="DefinedContributionPensionMember" xlink:title="DefinedContributionPensionMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="DefinedContributionPensionMember" xlink:title="definition: ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to DefinedContributionPensionMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_Non-DefinedRetirementFundMember" xlink:label="Non-DefinedRetirementFundMember" xlink:title="Non-DefinedRetirementFundMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="Non-DefinedRetirementFundMember" xlink:title="definition: ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to Non-DefinedRetirementFundMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="StatementClassOfStockAxis" xlink:title="StatementClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="StatementClassOfStockAxis" xlink:title="definition: ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable to StatementClassOfStockAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain_2" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain_2" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="CommonClassAMember" xlink:title="CommonClassAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassAMember" xlink:title="definition: ClassOfStockDomain to CommonClassAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="CommonClassBMember" xlink:title="CommonClassBMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassBMember" xlink:title="definition: ClassOfStockDomain to CommonClassBMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/CommonStockDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="StatementLineItems" xlink:title="StatementLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount" xlink:label="StockRepurchaseProgramAuthorizedAmount" xlink:title="StockRepurchaseProgramAuthorizedAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="StockRepurchaseProgramAuthorizedAmount" xlink:title="definition: StatementLineItems to StockRepurchaseProgramAuthorizedAmount" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" xlink:label="StockRepurchasedAndRetiredDuringPeriodShares" xlink:title="StockRepurchasedAndRetiredDuringPeriodShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="StockRepurchasedAndRetiredDuringPeriodShares" xlink:title="definition: StatementLineItems to StockRepurchasedAndRetiredDuringPeriodShares" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:label="StockRepurchasedAndRetiredDuringPeriodValue" xlink:title="StockRepurchasedAndRetiredDuringPeriodValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementLineItems" xlink:to="StockRepurchasedAndRetiredDuringPeriodValue" xlink:title="definition: StatementLineItems to StockRepurchasedAndRetiredDuringPeriodValue" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="StatementTable" xlink:title="StatementTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="StatementLineItems" xlink:to="StatementTable" xlink:title="definition: StatementLineItems to StatementTable" order="4.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="StatementClassOfStockAxis" xlink:title="StatementClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="StatementTable" xlink:to="StatementClassOfStockAxis" xlink:title="definition: StatementTable to StatementClassOfStockAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain_2" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain_2" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="CommonClassBMember" xlink:title="CommonClassBMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassBMember" xlink:title="definition: ClassOfStockDomain to CommonClassBMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/AccumulatedOtherComprehensiveLossDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/LegalProceedingsDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/RelatedPartyTransactionsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="RelatedPartyTransactionLineItems" xlink:title="RelatedPartyTransactionLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MoneyMarketFundsAtCarryingValue" xlink:label="MoneyMarketFundsAtCarryingValue" xlink:title="MoneyMarketFundsAtCarryingValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RelatedPartyTransactionLineItems" xlink:to="MoneyMarketFundsAtCarryingValue" xlink:title="definition: RelatedPartyTransactionLineItems to MoneyMarketFundsAtCarryingValue" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_EquityInterestHeldByInvestor" xlink:label="EquityInterestHeldByInvestor" xlink:title="EquityInterestHeldByInvestor" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RelatedPartyTransactionLineItems" xlink:to="EquityInterestHeldByInvestor" xlink:title="definition: RelatedPartyTransactionLineItems to EquityInterestHeldByInvestor" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:title="ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="RelatedPartyTransactionLineItems" xlink:to="ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:title="definition: RelatedPartyTransactionLineItems to ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" order="3.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="RelatedPartyTransactionsByRelatedPartyAxis" xlink:title="RelatedPartyTransactionsByRelatedPartyAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:to="RelatedPartyTransactionsByRelatedPartyAxis" xlink:title="definition: ScheduleOfRelatedPartyTransactionsByRelatedPartyTable to RelatedPartyTransactionsByRelatedPartyAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="RelatedPartyDomain" xlink:title="RelatedPartyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="RelatedPartyDomain" xlink:title="definition: RelatedPartyTransactionsByRelatedPartyAxis to RelatedPartyDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="RelatedPartyDomain_2" xlink:title="RelatedPartyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="RelatedPartyDomain_2" xlink:title="definition: RelatedPartyTransactionsByRelatedPartyAxis to RelatedPartyDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InvestorMember" xlink:label="InvestorMember" xlink:title="InvestorMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RelatedPartyDomain" xlink:to="InvestorMember" xlink:title="definition: RelatedPartyDomain to InvestorMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="StatementClassOfStockAxis" xlink:title="StatementClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:to="StatementClassOfStockAxis" xlink:title="definition: ScheduleOfRelatedPartyTransactionsByRelatedPartyTable to StatementClassOfStockAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="ClassOfStockDomain_2" xlink:title="ClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementClassOfStockAxis" xlink:to="ClassOfStockDomain_2" xlink:title="definition: StatementClassOfStockAxis to ClassOfStockDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="CommonClassAMember" xlink:title="CommonClassAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassOfStockDomain" xlink:to="CommonClassAMember" xlink:title="definition: ClassOfStockDomain to CommonClassAMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://belfuse.com/role/SubsequentEventsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsequentEventLineItems" xlink:label="SubsequentEventLineItems" xlink:title="SubsequentEventLineItems" />
    <link:loc xlink:type="locator" xlink:href="belfb-20120930.xsd#belfb_SubsequentEventsMaximumInsuranceDeductibleAmount" xlink:label="SubsequentEventsMaximumInsuranceDeductibleAmount" xlink:title="SubsequentEventsMaximumInsuranceDeductibleAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SubsequentEventLineItems" xlink:to="SubsequentEventsMaximumInsuranceDeductibleAmount" xlink:title="definition: SubsequentEventLineItems to SubsequentEventsMaximumInsuranceDeductibleAmount" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsequentEventTable" xlink:label="SubsequentEventTable" xlink:title="SubsequentEventTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="SubsequentEventLineItems" xlink:to="SubsequentEventTable" xlink:title="definition: SubsequentEventLineItems to SubsequentEventTable" order="2.0" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="SubsequentEventTypeAxis" xlink:title="SubsequentEventTypeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="SubsequentEventTable" xlink:to="SubsequentEventTypeAxis" xlink:title="definition: SubsequentEventTable to SubsequentEventTypeAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="SubsequentEventTypeDomain" xlink:title="SubsequentEventTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="SubsequentEventTypeAxis" xlink:to="SubsequentEventTypeDomain" xlink:title="definition: SubsequentEventTypeAxis to SubsequentEventTypeDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="SubsequentEventTypeDomain_2" xlink:title="SubsequentEventTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="SubsequentEventTypeAxis" xlink:to="SubsequentEventTypeDomain_2" xlink:title="definition: SubsequentEventTypeAxis to SubsequentEventTypeDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="SubsequentEventMember" xlink:title="SubsequentEventMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SubsequentEventTypeDomain" xlink:to="SubsequentEventMember" xlink:title="definition: SubsequentEventTypeDomain to SubsequentEventMember" order="1.0" />
  </link:definitionLink>
</link:linkbase>