<SEC-DOCUMENT>0001140361-12-026217.txt : 20120518
<SEC-HEADER>0001140361-12-026217.hdr.sgml : 20120518
<ACCEPTANCE-DATETIME>20120518102141
ACCESSION NUMBER:		0001140361-12-026217
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20120516
FILED AS OF DATE:		20120518
DATE AS OF CHANGE:		20120518

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SEGALL MARK B
		CENTRAL INDEX KEY:			0001116572

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-11676
		FILM NUMBER:		12854171

	MAIL ADDRESS:	
		STREET 1:		251 WEST 89TH STREET APT 20
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10024

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BEL FUSE INC /NJ
		CENTRAL INDEX KEY:			0000729580
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRONIC COILS, TRANSFORMERS & OTHER INDUCTORS [3677]
		IRS NUMBER:				221463699
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		206 VAN VORST ST.
		CITY:			JERSEY CITY
		STATE:			NJ
		ZIP:			07032
		BUSINESS PHONE:		2014320463

	MAIL ADDRESS:	
		STREET 1:		206 VAN VORST ST.
		CITY:			JERSEY CITY
		STATE:			NJ
		ZIP:			07032
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0305</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2012-05-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000729580</issuerCik>
        <issuerName>BEL FUSE INC /NJ</issuerName>
        <issuerTradingSymbol>BELFB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001116572</rptOwnerCik>
            <rptOwnerName>SEGALL MARK B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BEL FUSE INC.</rptOwnerStreet1>
            <rptOwnerStreet2>206 VAN VORST STREET</rptOwnerStreet2>
            <rptOwnerCity>JERSEY CITY</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2012-05-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Mr. Segall was granted 4,000 restricted shares of Class B Common Stock on May 16, 2012.  These restricted shares vest as follows:  1,000 shares vest as of May 16, 2014, 1,000 shares vest as of May 16, 2015, 1,000 shares vest as of May 16, 2016 and 1,000 shares vest as of May 16, 2017.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Laura R. Kuntz, Esq., Attorney-In-Fact</signatureName>
        <signatureDate>2012-05-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
