<?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>
        <reportingOwnerId>
            <rptOwnerCik>0001198356</rptOwnerCik>
            <rptOwnerName>PILEGGI DOMINIC J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8155 T&amp;B BOULEVARD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MEMPHIS,</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>38125</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman and CEO</officerTitle>
        </reportingOwnerRelationship>
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            <securityTitle>
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                <value>2012-05-16</value>
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                <transactionShares>
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                <transactionPricePerShare>
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                </transactionAcquiredDisposedCode>
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            <underlyingSecurity>
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                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
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                <natureOfOwnership>
                    <value></value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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            <conversionOrExercisePrice>
                <value>27.69</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2012-05-16</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>170765</value>
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                <transactionPricePerShare>
                    <value>44.31</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
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            <expirationDate>
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            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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            <ownershipNature>
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        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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            <transactionDate>
                <value>2012-05-16</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>320376</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>18.84</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
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            <expirationDate>
                <value>2018-12-02</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <transactionDate>
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                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>174430</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>37.43</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <expirationDate>
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            <underlyingSecurity>
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                    <value>Common Stock</value>
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                <underlyingSecurityShares>
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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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                    <value>Common Stock</value>
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        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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                    <value>92553</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>
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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
0001198356
PILEGGI DOMINIC J
8155 T&B BOULEVARD
MEMPHIS,
TN
38125
1
1
0
0
Chairman and CEO
Common Stock
2012-05-16
4
D
0
144128
72.00
D
0
D
Employee Stock Option (Right to Buy)
51.98
2012-05-16
4
D
0
77232
20.02
D
2014-02-04
Common Stock
77232
0
D
Employee Stock Option (Right to Buy)
42.45
2012-05-16
4
D
0
57717
29.55
D
2015-02-02
Common Stock
57717
0
D
Employee Stock Option (Right to Buy)
27.285
2012-05-16
4
D
0
68178
44.715
D
2016-02-01
Common Stock
68178
0
D
Employee Stock Option (Right to Buy)
24.11
2012-05-16
4
D
0
67412
47.89
D
2017-01-31
Common Stock
67412
0
D
Employee Stock Option (Right to Buy)
27.69
2012-05-16
4
D
0
170765
44.31
D
2018-01-30
Common Stock
170765
0
D
Employee Stock Option (Right to Buy)
53.16
2012-05-16
4
D
0
320376
18.84
D
2018-12-02
Common Stock
320376
0
D
Employee Stock Option (Right to Buy)
34.57
2012-05-16
4
D
0
174430
37.43
D
2019-12-02
Common Stock
174430
0
D
Employee Stock Option (Right to Buy)
25.29
2012-05-16
4
D
0
100379
46.71
D
2020-12-01
Common Stock
100379
0
D
Employee Stock Option (Right to Buy)
19.30
2012-05-16
4
D
0
92553
52.70
D
2021-12-07
Common Stock
92553
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