<?xml version="1.0"?>
<ownershipDocument>

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

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000097854</issuerCik>
        <issuerName>THOMAS &amp; BETTS CORP</issuerName>
        <issuerTradingSymbol>TNB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
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            <rptOwnerCik>0001198357</rptOwnerCik>
            <rptOwnerName>RAINES J N</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8155 T&amp;B BOULEVARD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MEMPHIS,</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>38125</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP-General Counsel &amp; Secretary</officerTitle>
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                <footnoteId id="F2"/>
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            <securityTitle>
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                <transactionPricePerShare>
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            <expirationDate>
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                </underlyingSecurityTitle>
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                <natureOfOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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            <conversionOrExercisePrice>
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            <transactionDate>
                <value>2012-05-16</value>
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            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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        <derivativeTransaction>
            <securityTitle>
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            <transactionDate>
                <value>2012-05-16</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>42559</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>18.84</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <footnoteId id="F7"/>
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            <expirationDate>
                <value>2018-12-03</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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                <value>34.57</value>
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            <transactionDate>
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            <transactionCoding>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>23171</value>
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                <transactionPricePerShare>
                    <value>37.43</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
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                    <value>23171</value>
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        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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                <transactionPricePerShare>
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                    <value>D</value>
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            <expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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                <transactionPricePerShare>
                    <value>52.70</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <footnoteId id="F10"/>
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            <expirationDate>
                <value>2021-12-07</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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    </derivativeTable>

    <footnotes>
        <footnote id="F1">Disposition of shares pursuant to the Agreement and Plan of Merger by and among ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation for a cash payment of $72.00 per share.</footnote>
        <footnote id="F2">This option, which provided for vesting in three equal annual installments beginning February 4, 2005, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.</footnote>
        <footnote id="F3">This option, which provided for vesting in three equal annual installments beginning February 2, 2006, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.</footnote>
        <footnote id="F4">This option, which provided for vesting in three equal annual installments beginning February 1, 2007, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.</footnote>
        <footnote id="F5">This option, which provided for vesting in three equal annual installments beginning January 31, 2008, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.</footnote>
        <footnote id="F6">This option, which provided for vesting in three equal annual installments beginning January 30, 2009, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.</footnote>
        <footnote id="F7">This option, which provided for vesting in three equal annual installments beginning December 3, 2009, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.</footnote>
        <footnote id="F8">This option, which provided for vesting in three equal annual installments beginning December 2, 2010, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.</footnote>
        <footnote id="F9">This option, which provided for vesting in three equal annual installments beginning December 1, 2011, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.</footnote>
        <footnote id="F10">This option, which provided for vesting in three equal annual installments beginning December 7, 2012, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas &amp; Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>W. David Smith, Jr.,  Attorney-in-Fact</signatureName>
        <signatureDate>2012-05-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0305
4
2012-05-16
1
0000097854
THOMAS & BETTS CORP
TNB
0001198357
RAINES J N
8155 T&B BOULEVARD
MEMPHIS,
TN
38125
0
1
0
0
VP-General Counsel & Secretary
Common Stock
2012-05-16
4
D
0
34180
72.00
D
0
D
Employee Stock Option (Right to Buy)
51.98
2012-05-16
4
D
0
2348
20.02
D
2014-02-04
Common Stock
2348
0
D
Employee Stock Option (Right to Buy)
42.45
2012-05-16
4
D
0
11126
29.55
D
2015-02-02
Common Stock
11126
0
D
Employee Stock Option (Right to Buy)
27.285
2012-05-16
4
D
0
12837
44.715
D
2016-02-01
Common Stock
12837
0
D
Employee Stock Option (Right to Buy)
24.11
2012-05-16
4
D
0
12693
47.89
D
2017-01-31
Common Stock
12693
0
D
Employee Stock Option (Right to Buy)
22.684
2012-05-16
4
D
0
22684
44.31
D
2018-01-30
Common Stock
22684
0
D
Employee Stock Option (Right to Buy)
53.16
2012-05-16
4
D
0
42559
18.84
D
2018-12-03
Common Stock
42559
0
D
Employee Stock Option (Right to Buy)
34.57
2012-05-16
4
D
0
23171
37.43
D
2019-12-02
Common Stock
23171
0
D
Employee Stock Option (Right to Buy)
25.29
2012-05-16
4
D
0
13334
46.71
D
2020-12-01
Common Stock
13334
0
D
Employee Stock Option (Right to Buy)
19.30
2012-05-16
4
D
0
12295
52.70
D
2021-12-07
Common Stock
12295
0
D
Disposition of shares pursuant to the Agreement and Plan of Merger by and among ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation for a cash payment of $72.00 per share.
This option, which provided for vesting in three equal annual installments beginning February 4, 2005, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.
This option, which provided for vesting in three equal annual installments beginning February 2, 2006, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.
This option, which provided for vesting in three equal annual installments beginning February 1, 2007, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.
This option, which provided for vesting in three equal annual installments beginning January 31, 2008, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.
This option, which provided for vesting in three equal annual installments beginning January 30, 2009, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.
This option, which provided for vesting in three equal annual installments beginning December 3, 2009, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.
This option, which provided for vesting in three equal annual installments beginning December 2, 2010, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.
This option, which provided for vesting in three equal annual installments beginning December 1, 2011, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.
This option, which provided for vesting in three equal annual installments beginning December 7, 2012, was converted in the merger between ABB Ltd., Edison Acquisition Corporation and Thomas & Betts Corporation into the right to receive a cash payment of $72.00 minus the exercise price.
W. David Smith, Jr.,  Attorney-in-Fact
2012-05-17