<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
<!--Generated by ThunderDome XBRL - 05:55PM UTC 2026-05-05--><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:belfa="http://belfuse.com/20260331" xmlns:country="http://xbrl.sec.gov/country/2026" xmlns:currency="http://xbrl.sec.gov/currency/2026" xmlns:dei="http://xbrl.sec.gov/dei/2026" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:ecd="http://xbrl.sec.gov/ecd/2026" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:exch="http://xbrl.sec.gov/exch/2026" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:naics="http://xbrl.sec.gov/naics/2026" xmlns:sic="http://xbrl.sec.gov/sic/2026" xmlns:srt="http://fasb.org/srt/2026" xmlns:srt-types="http://fasb.org/srt-types/2026" xmlns:stpr="http://xbrl.sec.gov/stpr/2026" xmlns:us-gaap="http://fasb.org/us-gaap/2026" xmlns:us-types="http://fasb.org/us-types/2026" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://belfuse.com/20260331">
  <xsd:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/exch/2026" schemaLocation="https://xbrl.sec.gov/exch/2026/exch-2026.xsd"/>
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/currency/2026" schemaLocation="https://xbrl.sec.gov/currency/2026/currency-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/country/2026" schemaLocation="https://xbrl.sec.gov/country/2026/country-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/naics/2026" schemaLocation="https://xbrl.sec.gov/naics/2026/naics-2026.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xsd:import namespace="http://xbrl.org/2020/extensible-enumerations-2.0" schemaLocation="https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/stpr/2026" schemaLocation="https://xbrl.sec.gov/stpr/2026/stpr-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/sic/2026" schemaLocation="https://xbrl.sec.gov/sic/2026/sic-2026.xsd"/>
  <xsd:import namespace="http://fasb.org/us-types/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-types-2026.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/>
  <xsd:import namespace="http://fasb.org/srt-types/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-types-2026.xsd"/>
  <xsd:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="belfa-20260331_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="belfa-20260331_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="belfa-20260331_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="belfa-20260331_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="statement-document-and-entity-information" roleURI="http://belfuse.com/20260331/role/statement-document-and-entity-information">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">000 - Document - Document And Entity Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-balance-sheets-current-period-unaudited" roleURI="http://belfuse.com/20260331/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals" roleURI="http://belfuse.com/20260331/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-statements-of-operations-unaudited" roleURI="http://belfuse.com/20260331/role/statement-condensed-consolidated-statements-of-operations-unaudited">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">003 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-statements-of-comprehensive-income-unaudited" roleURI="http://belfuse.com/20260331/role/statement-condensed-consolidated-statements-of-comprehensive-income-unaudited">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">004 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-statements-of-comprehensive-income-unaudited-parentheticals" roleURI="http://belfuse.com/20260331/role/statement-condensed-consolidated-statements-of-comprehensive-income-unaudited-parentheticals">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">005 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-statements-of-shareholders-equity-and-redeemable-noncontrolling-interest-unaudited" roleURI="http://belfuse.com/20260331/role/statement-condensed-consolidated-statements-of-shareholders-equity-and-redeemable-noncontrolling-interest-unaudited">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">006 - Statement - Condensed Consolidated Statements of Shareholders' Equity and Redeemable Noncontrolling Interest (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-statements-of-shareholders-equity-and-redeemable-noncontrolling-interest-unaudited-parentheticals" roleURI="http://belfuse.com/20260331/role/statement-condensed-consolidated-statements-of-shareholders-equity-and-redeemable-noncontrolling-interest-unaudited-parentheticals">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">007 - Statement - Condensed Consolidated Statements of Shareholders' Equity and Redeemable Noncontrolling Interest (Unaudited) (Parentheticals)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-statements-of-cash-flows-unaudited" roleURI="http://belfuse.com/20260331/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">008 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-1-description-of-business-and-summary-of-significant-accounting-policies" roleURI="http://belfuse.com/20260331/role/statement-note-1-description-of-business-and-summary-of-significant-accounting-policies">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">009 - Disclosure - Note 1 - Description of Business and Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-2-acquisition" roleURI="http://belfuse.com/20260331/role/statement-note-2-acquisition">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">010 - Disclosure - Note 2 - Acquisition</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-3-revenue" roleURI="http://belfuse.com/20260331/role/statement-note-3-revenue">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">011 - Disclosure - Note 3 - Revenue</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-4-earnings-per-share" roleURI="http://belfuse.com/20260331/role/statement-note-4-earnings-per-share">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">012 - Disclosure - Note 4 - Earnings Per Share</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-5-fair-value-measurements" roleURI="http://belfuse.com/20260331/role/statement-note-5-fair-value-measurements">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">013 - Disclosure - Note 5 - Fair Value Measurements</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-6-inventories" roleURI="http://belfuse.com/20260331/role/statement-note-6-inventories">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">014 - Disclosure - Note 6 - Inventories</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-7-property-plant-and-equipment" roleURI="http://belfuse.com/20260331/role/statement-note-7-property-plant-and-equipment">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">015 - Disclosure - Note 7 - Property, Plant and Equipment</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-8-accrued-expenses" roleURI="http://belfuse.com/20260331/role/statement-note-8-accrued-expenses">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">016 - Disclosure - Note 8 - Accrued Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-9-derivative-instruments-and-hedging-activities" roleURI="http://belfuse.com/20260331/role/statement-note-9-derivative-instruments-and-hedging-activities">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">017 - Disclosure - Note 9 - Derivative Instruments and Hedging Activities</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-10-debt" roleURI="http://belfuse.com/20260331/role/statement-note-10-debt">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">018 - Disclosure - Note 10 - Debt</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-11-income-taxes" roleURI="http://belfuse.com/20260331/role/statement-note-11-income-taxes">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">019 - Disclosure - Note 11 - Income Taxes</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-12-retirement-savings-and-deferred-compensation-plans" roleURI="http://belfuse.com/20260331/role/statement-note-12-retirement-savings-and-deferred-compensation-plans">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">020 - Disclosure - Note 12 - Retirement, Savings and Deferred Compensation Plans</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-13-accumulated-other-comprehensive-loss" roleURI="http://belfuse.com/20260331/role/statement-note-13-accumulated-other-comprehensive-loss">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">021 - Disclosure - Note 13 - Accumulated Other Comprehensive Loss</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-14-commitments-and-contingencies" roleURI="http://belfuse.com/20260331/role/statement-note-14-commitments-and-contingencies">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">022 - Disclosure - Note 14 - Commitments and Contingencies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-15-segments" roleURI="http://belfuse.com/20260331/role/statement-note-15-segments">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">023 - Disclosure - Note 15 - Segments</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-significant-accounting-policies-policies" roleURI="http://belfuse.com/20260331/role/statement-significant-accounting-policies-policies">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995470 - Disclosure - Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-2-acquisition-tables" roleURI="http://belfuse.com/20260331/role/statement-note-2-acquisition-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995471 - Disclosure - Note 2 - Acquisition (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-3-revenue-tables" roleURI="http://belfuse.com/20260331/role/statement-note-3-revenue-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995472 - Disclosure - Note 3 - Revenue (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-4-earnings-per-share-tables" roleURI="http://belfuse.com/20260331/role/statement-note-4-earnings-per-share-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995473 - Disclosure - Note 4 - Earnings Per Share (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-5-fair-value-measurements-tables" roleURI="http://belfuse.com/20260331/role/statement-note-5-fair-value-measurements-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995474 - Disclosure - Note 5 - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-6-inventories-tables" roleURI="http://belfuse.com/20260331/role/statement-note-6-inventories-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995475 - Disclosure - Note 6 - Inventories (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-7-property-plant-and-equipment-tables" roleURI="http://belfuse.com/20260331/role/statement-note-7-property-plant-and-equipment-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995476 - Disclosure - Note 7 - Property, Plant and Equipment (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-8-accrued-expenses-tables" roleURI="http://belfuse.com/20260331/role/statement-note-8-accrued-expenses-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995477 - Disclosure - Note 8 - Accrued Expenses (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-9-derivative-instruments-and-hedging-activities-tables" roleURI="http://belfuse.com/20260331/role/statement-note-9-derivative-instruments-and-hedging-activities-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995478 - Disclosure - Note 9 - Derivative Instruments and Hedging Activities (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-12-retirement-savings-and-deferred-compensation-plans-tables" roleURI="http://belfuse.com/20260331/role/statement-note-12-retirement-savings-and-deferred-compensation-plans-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995479 - Disclosure - Note 12 - Retirement, Savings and Deferred Compensation Plans (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-13-accumulated-other-comprehensive-loss-tables" roleURI="http://belfuse.com/20260331/role/statement-note-13-accumulated-other-comprehensive-loss-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995480 - Disclosure - Note 13 - Accumulated Other Comprehensive Loss (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-15-segments-tables" roleURI="http://belfuse.com/20260331/role/statement-note-15-segments-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995481 - Disclosure - Note 15 - Segments (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-2-acquisition-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-2-acquisition-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995482 - Disclosure - Note 2 - Acquisition (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-2-acquisition-purchase-price-allocation-details" roleURI="http://belfuse.com/20260331/role/statement-note-2-acquisition-purchase-price-allocation-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995483 - Disclosure - Note 2 - Acquisition - Purchase Price Allocation (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-2-acquisition-pro-forma-information-details" roleURI="http://belfuse.com/20260331/role/statement-note-2-acquisition-pro-forma-information-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995484 - Disclosure - Note 2 - Acquisition - Pro Forma Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-3-revenue-1-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-3-revenue-1-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995485 - Disclosure - Note 3 - Revenue 1 (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-3-revenue-2-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-3-revenue-2-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995486 - Disclosure - Note 3 - Revenue 2 (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-3-revenue-disaggregation-of-revenue-by-product-group-and-sales-channel-details" roleURI="http://belfuse.com/20260331/role/statement-note-3-revenue-disaggregation-of-revenue-by-product-group-and-sales-channel-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995487 - Disclosure - Note 3 - Revenue - Disaggregation of Revenue by Product Group and Sales Channel (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-3-revenue-contract-assets-and-contract-liabilities-details" roleURI="http://belfuse.com/20260331/role/statement-note-3-revenue-contract-assets-and-contract-liabilities-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995488 - Disclosure - Note 3 - Revenue - Contract Assets and Contract Liabilities (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-4-earnings-per-share-earnings-per-share-details" roleURI="http://belfuse.com/20260331/role/statement-note-4-earnings-per-share-earnings-per-share-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995489 - Disclosure - Note 4 - Earnings Per Share - Earnings Per Share (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-5-fair-value-measurements-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-5-fair-value-measurements-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995490 - Disclosure - Note 5 - Fair Value Measurements (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-5-fair-value-measurements-fair-value-assets-by-investment-category-details" roleURI="http://belfuse.com/20260331/role/statement-note-5-fair-value-measurements-fair-value-assets-by-investment-category-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995491 - Disclosure - Note 5 - Fair Value Measurements - Fair Value Assets by Investment Category (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-5-fair-value-measurements-fair-value-of-derivative-financial-instruments-details" roleURI="http://belfuse.com/20260331/role/statement-note-5-fair-value-measurements-fair-value-of-derivative-financial-instruments-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995492 - Disclosure - Note 5 - Fair Value Measurements - Fair Value of Derivative Financial Instruments (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-5-fair-value-measurements-fair-value-of-earnout-liabilities-details" roleURI="http://belfuse.com/20260331/role/statement-note-5-fair-value-measurements-fair-value-of-earnout-liabilities-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995493 - Disclosure - Note 5 - Fair Value Measurements - Fair Value of Earnout Liabilities (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-6-inventories-components-of-inventories-details" roleURI="http://belfuse.com/20260331/role/statement-note-6-inventories-components-of-inventories-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995494 - Disclosure - Note 6 - Inventories - Components of Inventories (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-7-property-plant-and-equipment-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-7-property-plant-and-equipment-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995495 - Disclosure - Note 7 - Property, Plant and Equipment (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-7-property-plant-and-equipment-property-plant-and-equipment-details" roleURI="http://belfuse.com/20260331/role/statement-note-7-property-plant-and-equipment-property-plant-and-equipment-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995496 - Disclosure - Note 7 - Property, Plant and Equipment - Property, Plant and Equipment (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-8-accrued-expenses-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-8-accrued-expenses-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995497 - Disclosure - Note 8 - Accrued Expenses (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-8-accrued-expenses-accrued-expenses-details" roleURI="http://belfuse.com/20260331/role/statement-note-8-accrued-expenses-accrued-expenses-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995498 - Disclosure - Note 8 - Accrued Expenses - Accrued Expenses (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-8-accrued-expenses-activity-and-liability-balances-related-to-restructuring-costs-details" roleURI="http://belfuse.com/20260331/role/statement-note-8-accrued-expenses-activity-and-liability-balances-related-to-restructuring-costs-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995499 - Disclosure - Note 8 - Accrued Expenses - Activity and Liability Balances Related to Restructuring Costs (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-9-derivative-instruments-and-hedging-activities-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-9-derivative-instruments-and-hedging-activities-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995500 - Disclosure - Note 9 - Derivative Instruments and Hedging Activities (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-9-derivative-instruments-and-hedging-activities-derivative-financial-instruments-effects-on-accumulated-other-comprehensive-loss-details" roleURI="http://belfuse.com/20260331/role/statement-note-9-derivative-instruments-and-hedging-activities-derivative-financial-instruments-effects-on-accumulated-other-comprehensive-loss-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995501 - Disclosure - Note 9 - Derivative Instruments and Hedging Activities - Derivative Financial Instruments Effects on Accumulated Other Comprehensive Loss (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-9-derivative-instruments-and-hedging-activities-losses-gains-recognized-on-derivatives-instruments-not-designated-as-hedging-details" roleURI="http://belfuse.com/20260331/role/statement-note-9-derivative-instruments-and-hedging-activities-losses-gains-recognized-on-derivatives-instruments-not-designated-as-hedging-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995502 - Disclosure - Note 9 - Derivative Instruments and Hedging Activities - (Losses) Gains Recognized on Derivatives Instruments Not Designated as Hedging (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-10-debt-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-10-debt-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995503 - Disclosure - Note 10 - Debt (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-11-income-taxes-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-11-income-taxes-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995504 - Disclosure - Note 11 - Income Taxes (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-12-retirement-savings-and-deferred-compensation-plans-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-12-retirement-savings-and-deferred-compensation-plans-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995505 - Disclosure - Note 12 - Retirement, Savings and Deferred Compensation Plans (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-12-retirement-savings-and-deferred-compensation-plans-components-of-serp-expense-details" roleURI="http://belfuse.com/20260331/role/statement-note-12-retirement-savings-and-deferred-compensation-plans-components-of-serp-expense-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995506 - Disclosure - Note 12 - Retirement, Savings and Deferred Compensation Plans - Components of SERP Expense (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-12-retirement-savings-and-deferred-compensation-plans-recognized-in-accumulated-other-comprehensive-loss-details" roleURI="http://belfuse.com/20260331/role/statement-note-12-retirement-savings-and-deferred-compensation-plans-recognized-in-accumulated-other-comprehensive-loss-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995507 - Disclosure - Note 12 - Retirement, Savings, and Deferred Compensation Plans - Recognized in Accumulated Other Comprehensive Loss (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-13-accumulated-other-comprehensive-loss-accumulated-other-comprehensive-loss-details" roleURI="http://belfuse.com/20260331/role/statement-note-13-accumulated-other-comprehensive-loss-accumulated-other-comprehensive-loss-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995508 - Disclosure - Note 13 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-13-accumulated-other-comprehensive-loss-accumulated-other-comprehensive-loss-details-parentheticals" roleURI="http://belfuse.com/20260331/role/statement-note-13-accumulated-other-comprehensive-loss-accumulated-other-comprehensive-loss-details-parentheticals">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995509 - Disclosure - Note 13 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) (Parentheticals)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-13-accumulated-other-comprehensive-loss-changes-in-accumulated-other-comprehensive-loss-by-component-details" roleURI="http://belfuse.com/20260331/role/statement-note-13-accumulated-other-comprehensive-loss-changes-in-accumulated-other-comprehensive-loss-by-component-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995510 - Disclosure - Note 13 - Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-14-commitments-and-contingencies-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-14-commitments-and-contingencies-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995511 - Disclosure - Note 14 - Commitments and Contingencies (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-15-segments-details-textual" roleURI="http://belfuse.com/20260331/role/statement-note-15-segments-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995512 - Disclosure - Note 15 - Segments (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-15-segments-segmented-earnings-breakdown-details" roleURI="http://belfuse.com/20260331/role/statement-note-15-segments-segmented-earnings-breakdown-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995513 - Disclosure - Note 15 - Segments - Segmented Earnings Breakdown (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-15-segments-segment-information-details" roleURI="http://belfuse.com/20260331/role/statement-note-15-segments-segment-information-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995514 - Disclosure - Note 15 - Segments - Segment Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element abstract="true" id="belfa_Above90AndLessThan100AchievementOfEarnoutMember" name="Above90AndLessThan100AchievementOfEarnoutMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_AccumulatedOtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentTax" name="AccumulatedOtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="belfa_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax" name="AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="belfa_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax" name="AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="belfa_AerospaceDefenseAndRuggedSolutionsSegmentMember" name="AerospaceDefenseAndRuggedSolutionsSegmentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_AociCashFlowHedgeCumulativeGainLossTax" name="AociCashFlowHedgeCumulativeGainLossTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="belfa_ArezzoRevenueAgencyMember" name="ArezzoRevenueAgencyMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_AssetsFairValueDisclosureIncludedInCashAndCashEquivalents" name="AssetsFairValueDisclosureIncludedInCashAndCashEquivalents" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="belfa_AssetsFairValueDisclosureIncludedInOtherCurrentAssets" name="AssetsFairValueDisclosureIncludedInOtherCurrentAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="belfa_BelFuseIncEmployeesSavingsPlanMember" name="BelFuseIncEmployeesSavingsPlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_BusinessAcquisitionProFormaNetIncomeLossAttributableToNoncontrollingInterests" name="BusinessAcquisitionProFormaNetIncomeLossAttributableToNoncontrollingInterests" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="belfa_BusinessAcquisitionProFormaProfitLoss" name="BusinessAcquisitionProFormaProfitLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="belfa_BusinessCombinationRecognizedAssetAcquiredAssetIncludingGoodwill" name="BusinessCombinationRecognizedAssetAcquiredAssetIncludingGoodwill" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="belfa_CommonStockOutstandingMember" name="CommonStockOutstandingMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_ContractWithCustomerLiabilityAdvancePaymentsReceived" name="ContractWithCustomerLiabilityAdvancePaymentsReceived" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="belfa_ContractWithCustomerLiabilityRevenueRecognizedDuringPeriod" name="ContractWithCustomerLiabilityRevenueRecognizedDuringPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_CreditAndSecurityAgreementWithKeyBankMember" name="CreditAndSecurityAgreementWithKeyBankMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_CustomsDutiesAndImposedFines" name="CustomsDutiesAndImposedFines" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="belfa_DatamateMember" name="DatamateMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_DeferredCompensationArrangementVestingAge" name="DeferredCompensationArrangementVestingAge" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="belfa_DocumentAndEntityInformation" name="DocumentAndEntityInformation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_EOSClaimFromPrincipalCommissionerOfCustomsMember" name="EOSClaimFromPrincipalCommissionerOfCustomsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_EOSPowerPanamaIncMember" name="EOSPowerPanamaIncMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_EarnoutLiabilityAdjustment" name="EarnoutLiabilityAdjustment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_EarnoutPaymentMember" name="EarnoutPaymentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_EnerconTechnologiesLtdMember" name="EnerconTechnologiesLtdMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_FullAchievementOfEarnoutMember" name="FullAchievementOfEarnoutMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_IndemnificationPeriod" name="IndemnificationPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_IndustrialTechnologyAndDataSolutionsSegmentMember" name="IndustrialTechnologyAndDataSolutionsSegmentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_InvestmentsHeldInRabbiTrustMember" name="InvestmentsHeldInRabbiTrustMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_LessThan90OfEarnoutMember" name="LessThan90OfEarnoutMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_MoneyMarketFundsRabbiTrustMember" name="MoneyMarketFundsRabbiTrustMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_NonqualifiedDeferredCompensationPlanMember" name="NonqualifiedDeferredCompensationPlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_NoteToFinancialStatementDetailsTextual" name="NoteToFinancialStatementDetailsTextual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_NotesToFinancialStatements" name="NotesToFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_NotesToFinancialStatementsAbstract" name="NotesToFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_NumberOfIndustryInWhichEntityOperates" name="NumberOfIndustryInWhichEntityOperates" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_PaymentForCustomsDutiesAndImposedFinesAndPenalties" name="PaymentForCustomsDutiesAndImposedFinesAndPenalties" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="belfa_PercentageOfGrossProfit" name="PercentageOfGrossProfit" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_PolicyTable" name="PolicyTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_RedemptionValueAdjustmentAttributableToNoncontrollingInterest" name="RedemptionValueAdjustmentAttributableToNoncontrollingInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="belfa_RestructuringCashPaymentsAndOtherSettlements" name="RestructuringCashPaymentsAndOtherSettlements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="belfa_ScheduleOfChangesInAccumulatedOtherComprehensiveIncomeLossByComponentTableTextBlock" name="ScheduleOfChangesInAccumulatedOtherComprehensiveIncomeLossByComponentTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="belfa_SharesHeldInPlan" name="SharesHeldInPlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="belfa_The2021SwapsOneMember" name="The2021SwapsOneMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_The2021SwapsTwoMember" name="The2021SwapsTwoMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-12-retirement-savings-and-deferred-compensation-plans-components-of-serp-expense-details" name="statement-statement-note-12-retirement-savings-and-deferred-compensation-plans-components-of-serp-expense-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-12-retirement-savings-and-deferred-compensation-plans-recognized-in-accumulated-other-comprehensive-loss-details" name="statement-statement-note-12-retirement-savings-and-deferred-compensation-plans-recognized-in-accumulated-other-comprehensive-loss-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-12-retirement-savings-and-deferred-compensation-plans-tables" name="statement-statement-note-12-retirement-savings-and-deferred-compensation-plans-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-13-accumulated-other-comprehensive-loss-accumulated-other-comprehensive-loss-details" name="statement-statement-note-13-accumulated-other-comprehensive-loss-accumulated-other-comprehensive-loss-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-13-accumulated-other-comprehensive-loss-accumulated-other-comprehensive-loss-details-parentheticals" name="statement-statement-note-13-accumulated-other-comprehensive-loss-accumulated-other-comprehensive-loss-details-parentheticals" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-13-accumulated-other-comprehensive-loss-changes-in-accumulated-other-comprehensive-loss-by-component-details" name="statement-statement-note-13-accumulated-other-comprehensive-loss-changes-in-accumulated-other-comprehensive-loss-by-component-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-13-accumulated-other-comprehensive-loss-tables" name="statement-statement-note-13-accumulated-other-comprehensive-loss-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-15-segments-segment-information-details" name="statement-statement-note-15-segments-segment-information-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-15-segments-segmented-earnings-breakdown-details" name="statement-statement-note-15-segments-segmented-earnings-breakdown-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-15-segments-tables" name="statement-statement-note-15-segments-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-2-acquisition-pro-forma-information-details" name="statement-statement-note-2-acquisition-pro-forma-information-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-2-acquisition-purchase-price-allocation-details" name="statement-statement-note-2-acquisition-purchase-price-allocation-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-2-acquisition-tables" name="statement-statement-note-2-acquisition-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-3-revenue-contract-assets-and-contract-liabilities-details" name="statement-statement-note-3-revenue-contract-assets-and-contract-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-3-revenue-disaggregation-of-revenue-by-product-group-and-sales-channel-details" name="statement-statement-note-3-revenue-disaggregation-of-revenue-by-product-group-and-sales-channel-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-3-revenue-tables" name="statement-statement-note-3-revenue-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-4-earnings-per-share-earnings-per-share-details" name="statement-statement-note-4-earnings-per-share-earnings-per-share-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-4-earnings-per-share-tables" name="statement-statement-note-4-earnings-per-share-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-5-fair-value-measurements-fair-value-assets-by-investment-category-details" name="statement-statement-note-5-fair-value-measurements-fair-value-assets-by-investment-category-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-5-fair-value-measurements-fair-value-of-derivative-financial-instruments-details" name="statement-statement-note-5-fair-value-measurements-fair-value-of-derivative-financial-instruments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-5-fair-value-measurements-fair-value-of-earnout-liabilities-details" name="statement-statement-note-5-fair-value-measurements-fair-value-of-earnout-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-5-fair-value-measurements-tables" name="statement-statement-note-5-fair-value-measurements-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-6-inventories-components-of-inventories-details" name="statement-statement-note-6-inventories-components-of-inventories-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-6-inventories-tables" name="statement-statement-note-6-inventories-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-7-property-plant-and-equipment-property-plant-and-equipment-details" name="statement-statement-note-7-property-plant-and-equipment-property-plant-and-equipment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-7-property-plant-and-equipment-tables" name="statement-statement-note-7-property-plant-and-equipment-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-8-accrued-expenses-accrued-expenses-details" name="statement-statement-note-8-accrued-expenses-accrued-expenses-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-8-accrued-expenses-activity-and-liability-balances-related-to-restructuring-costs-details" name="statement-statement-note-8-accrued-expenses-activity-and-liability-balances-related-to-restructuring-costs-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-8-accrued-expenses-tables" name="statement-statement-note-8-accrued-expenses-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-9-derivative-instruments-and-hedging-activities-derivative-financial-instruments-effects-on-accumulated-other-comprehensive-loss-details" name="statement-statement-note-9-derivative-instruments-and-hedging-activities-derivative-financial-instruments-effects-on-accumulated-other-comprehensive-loss-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-9-derivative-instruments-and-hedging-activities-losses-gains-recognized-on-derivatives-instruments-not-designated-as-hedging-details" name="statement-statement-note-9-derivative-instruments-and-hedging-activities-losses-gains-recognized-on-derivatives-instruments-not-designated-as-hedging-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-note-9-derivative-instruments-and-hedging-activities-tables" name="statement-statement-note-9-derivative-instruments-and-hedging-activities-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="belfa_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
