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

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    <documentType>4</documentType>

    <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>0001303129</rptOwnerCik>
            <rptOwnerName>Locke Stanley P</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>V.P. Bus Dev St. Planning</officerTitle>
        </reportingOwnerRelationship>
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            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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            <expirationDate>
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        <derivativeTransaction>
            <securityTitle>
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                <transactionShares>
                    <value>7262</value>
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                <transactionPricePerShare>
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                </transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
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                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
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                </underlyingSecurityShares>
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                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>27.69</value>
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            <transactionDate>
                <value>2012-05-16</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>10713</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>44.31</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
                <value>2018-01-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                    <value></value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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                <value>53.16</value>
            </conversionOrExercisePrice>
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                <value>2012-05-16</value>
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            <transactionCoding>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>29491</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>18.84</value>
                </transactionPricePerShare>
                <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>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
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            <ownershipNature>
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                    <value>D</value>
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                    <value></value>
                </natureOfOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>34.57</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2012-05-16</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>16056</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>37.43</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <footnoteId id="F8"/>
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            <expirationDate>
                <value>2019-12-02</value>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
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                    <value>16056</value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</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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                </underlyingSecurityShares>
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        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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            <transactionAmounts>
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                    <value>8520</value>
                </transactionShares>
                <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>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8520</value>
                </underlyingSecurityShares>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeTransaction>
    </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 September 13, 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
0001303129
Locke Stanley P
8155 T&B BOULEVARD
MEMPHIS
TN
38125
0
1
0
0
V.P. Bus Dev St. Planning
Common Stock
2012-05-16
4
D
0
18242
72.00
D
0
D
Employee Stock Option (Right to Buy)
46.07
2012-05-16
4
D
0
666
25.93
D
2014-09-13
Common Stock
666
0
D
Employee Stock Option (Right to Buy)
42.45
2012-05-16
4
D
0
1950
29.55
D
2015-02-02
Common Stock
1950
0
D
Employee Stock Option (Right to Buy)
27.285
2012-05-16
4
D
0
7345
44.715
D
2016-02-01
Common Stock
7345
0
D
Employee Stock Option (Right to Buy)
24.11
2012-05-16
4
D
0
7262
47.89
D
2017-01-31
Common Stock
7262
0
D
Employee Stock Option (Right to Buy)
27.69
2012-05-16
4
D
0
10713
44.31
D
2018-01-30
Common Stock
10713
0
D
Employee Stock Option (Right to Buy)
53.16
2012-05-16
4
D
0
29491
18.84
D
2018-12-03
Common Stock
29491
0
D
Employee Stock Option (Right to Buy)
34.57
2012-05-16
4
D
0
16056
37.43
D
2019-12-02
Common Stock
16056
0
D
Employee Stock Option (Right to Buy)
25.29
2012-05-16
4
D
0
9240
46.71
D
2020-12-01
Common Stock
9240
0
D
Employee Stock Option (Right to Buy)
19.30
2012-05-16
4
D
0
8520
52.70
D
2021-12-07
Common Stock
8520
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 September 13, 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