##### Table of Contents



UNITED STATES
 SECURITIES AND EXCHANGE
    COMMISSION
 Washington, D.C.
    20549
   FORM 11-K
  (Mark One)þ

ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE
    SECURITIES EXCHANGE ACT OF 1934For the fiscal
    year ended December 31,
    2010oro

TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE
    SECURITIES EXCHANGE ACT OF 1934For the transition period
    from          to   Commission file number:
    1-4682
   A.
    Full title of the plan and the address of the plan, if different
    from that of the issuer named below:   Thomas & Betts
    Corporation
  Employees Investment
    Plan
  B.
    Name of issuer of the securities held pursuant to the plan and
    the address of its principal executive office:  Thomas & Betts Corporation
 8155 T&B Boulevard
 Memphis, Tennessee 38125




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##### 



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
  TABLE OF CONTENTS
   
 Page No.Report of Independent Registered Public
    Accounting Firm


3Financial Statements:Statements of Net Assets Available for
    Benefits  December 31, 2010 and 2009


4Statements of Changes in Net Assets Available for
    Benefits  Years Ended December 31, 2010, 2009
    and 2008


5Notes to Financial Statements


6Schedule 1  Schedule H, Line
    4i  Schedule of Assets (held at end of
    year)  December 31, 2010


20Signature


21Exhibits Index


E-1Consent of Independent Registered Public Accounting FirmCONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM   2




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##### Table of Contents



REPORT OF
    INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM  
             3




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLANSTATEMENTS OF NET ASSETS AVAILABLE
    FOR BENEFITS
  December 31,2010


2009(In thousands)PLAN ASSETSInvestments at fair value:Mutual funds

$
175,802


$
155,551Collective trust fund


43,714



40,704Thomas & Betts Corporation stock fund


15,959



12,468Total investments at fair value


235,475



208,723Receivables:Contributions by participants






274Contributions by employer






169Notes receivable from participants


5,586



5,785Total receivables


5,586



6,228Net assets available for benefits before adjustment


241,061



214,951Adjustment from fair value to contract value for fully
    benefit-responsive investment contracts


(1,714
)


(879
)NET ASSETS AVAILABLE FOR BENEFITS

$
239,347


$
214,072   See accompanying notes to
    financial statements.
 4




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLANSTATEMENTS OF CHANGES IN NET
    ASSETS AVAILABLE FOR BENEFITS
  Years Ended December 31,2010


2009


2008(In thousands)Investment income (loss):Interest and dividends

$
4,740


$
4,517


$
5,466Net appreciation (depreciation) in fair value of investments:Net realized gain (loss) on sales of investments


1,938



(3,777
)


(2,601
)Unrealized appreciation (depreciation) of investments


18,963



36,388



(53,212
)20,901



32,611



(55,813
)Total investment income (loss)


25,641



37,128



(50,347
)Interest income on notes receivable from participants


321



375



409Contributions:Participants


13,883



10,843



11,136Employer


6,591



6,021



5,521Total contributions


20,474



16,864



16,657Assets received from plan mergers










40,299Total additions


46,436



54,367



7,018Administrative expenses


(120
)


(88
)


(78
)Withdrawals


(21,041
)


(21,432
)


(16,444
)Net increase (decrease)


25,275



32,847



(9,504
)Net assets available for benefits:Beginning of year


214,072



181,225



190,729End of year

$
239,347


$
214,072


$
181,225   See accompanying notes to
    financial statements.
 5




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLANNOTES TO FINANCIAL STATEMENTS
  Note 1:
    Plan
    Description  General
    Events
    Affecting the Corporation and the Plan
  Contributions
    Related to Change in Pension Benefits
    Acquisitions
    and Mergers
        Contributions
    by Participants and Employer
     6




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
        catch-up catch-up
  Nonelective
    Contributions by Employer
    Participant
    Accounts
    Vesting
    Forfeitures
     7




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
    Investment
    Funds
    Domestic Equity Mutual Funds:(1)

Vanguard 500 Index Fund  invests in the common
    stock of major corporations, with the view to achieve a return
    on investments equal to the Standard & Poors 500
    index.(2)

Vanguard U.S. Growth Fund  invests mainly in
    large-capitalization stocks of companies based in the United
    States.(3)

Vanguard Windsor II Fund  invests in
    undervalued, income-producing stocks, characterized by
    above-average income yields and below-average price/earnings
    ratios relative to the stock market.(4)

Vanguard PRIMECAP Fund  seeks long-term
    capital appreciation, using a fundamental approach to invest in
    growth-oriented companies at attractive valuation levels,
    generally large- and mid-capitalization stocks.(5)

Vanguard Explorer Fund  invests in a
    diversified group of small-company stocks with prospects for
    above-average growth.(6)

Vanguard Extended Market Index Fund  utilizes
    a passive management or indexing approach which seeks to track
    the performance of the Standard & Poors
    Completion Index, a broadly diversified index of stocks of small
    and medium-size U.S. companies.(7)

Vanguard Capital Opportunity Fund  invests
    mainly in U.S. stocks, with an emphasis on companies that have
    prospects for rapid earnings growth.(8)

Vanguard Growth Index Fund  utilizes a passive
    management or indexing approach which seeks to track the
    performance of the MSCI US Prime Market Growth Index, a broadly
    diversified index representing large U.S. companies.International Equity Mutual Fund:(9)

Vanguard International Growth Fund invests in
    the stocks of companies located outside the United States with
    above-average growth potential.   Life
    Cycle /Target Date Mutual Funds:
  Year Investors Plan to
    Retire(10)

Vanguard Target Retirement 2005 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Before 2008 8




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
  Year Investors Plan to
    Retire(11)

Vanguard Target Retirement 2010 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Between 2008 and 2012(12)

Vanguard Target Retirement 2015 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Between 2013 and 2017(13)

Vanguard Target Retirement 2020 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Between 2018 and 2022(14)

Vanguard Target Retirement 2025 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Between 2023 and 2027(15)

Vanguard Target Retirement 2030 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Between 2028 and 2032(16)

Vanguard Target Retirement 2035 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Between 2033 and 2037(17)

Vanguard Target Retirement 2040 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Between 2038 and 2042(18)

Vanguard Target Retirement 2045 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Between 2043 and 2047(19)

Vanguard Target Retirement 2050 Fund  invests
    in other Vanguard mutual funds with asset allocations becoming
    more conservative over time as investors plan to retire.

Between 2048 and 2052(20)

Vanguard Target Retirement Income Fund invests in other Vanguard mutual funds with
    asset allocations designed for investors currently in
    retirement.   9




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
  Balanced Mutual Fund:(21)

Vanguard Wellington Fund invests 60% to 70%
    of its assets in common stocks of established medium-size and
    large companies, commonly referred to as value stocks. Remainder
    of assets invested mainly in fixed income securities, such as
    corporate bonds and U.S. Government securities.Fixed Income Mutual Fund:(22)

Vanguard Total Bond Market Index Fund utilizes a passive management or indexing
    approach which seeks to track the performance of the Barclays
    Capital U.S. Aggregate Bond Index, which measures a wide
    spectrum of public, investment-grade, taxable, fixed income
    securities in the United States.Money Market Mutual Fund:(23)

Vanguard Prime Money Market Fund invests in
    high-quality, short-term securities with the goal to maintain
    the $1 value of its shares while providing income. This fund is
    not an available investment option for participants. The Plan
    authorizes this investment fund for unallocated forfeitures only.Collective Trust Fund:(24)

Vanguard Retirement Savings Trust collective
    trust fund that invests in investment contracts issued by
    insurance companies and commercial banks, and similar types of
    fixed principal investments.Thomas & Betts Corporation Stock Fund:(25)

Thomas & Betts Corporation Stock Fund invests in common stock of the Corporation and a
    Vanguard money market fund.     Participant
    Loans
   10




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
    Distributions
    of Benefits and Withdrawals
     Note 2:
    Accounting
    Policies  Basis
    of Presentation
    Use of
    Estimates in Preparation of Financial Statements
    Payments
    of Benefits
    Note 3:
    Fair
    Value Measurements   11




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
    Investments at Fair ValueValuationInvestments at





TechniquesFair Value as


Valuation


IncorporatingDetermined by


Techniques


InformationQuoted Prices


Based on


Other Thanin Active


Observable


ObservableMarkets


Market Data


Market Data(Level 1)


(Level 2)


(Level 3)


Total(In thousands)Mutual funds:Domestic Equity

$
78,114


$



$



$
78,114International Equity


14,772











14,772Life Cycle/Target Date


34,386











34,386Balanced


30,440











30,440Fixed Income


17,627











17,627Money Market


463











463Collective trust fund






43,714







43,714Thomas & Betts Corporation stock fund


15,959











15,959Total investments at fair value

$
191,761


$
43,714


$



$
235,475  12




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
    Investments at Fair ValueValuationInvestments at





TechniquesFair Value as


Valuation


IncorporatingDetermined by


Techniques


InformationQuoted Prices


Based on


Other Thanin Active


Observable


ObservableMarkets


Market Data


Market Data(Level 1)


(Level 2)


(Level 3)


Total(In thousands)Mutual funds:Domestic Equity

$
72,274


$



$



$
72,274International Equity


13,937











13,937Life Cycle/Target Date


21,204











21,204Balanced


29,798











29,798Fixed Income


18,016











18,016Money Market


322











322Collective trust fund






40,704







40,704Thomas & Betts Corporation stock fund


12,468











12,468Total investments at fair value

$
168,019


$
40,704


$



$
208,723     Mutual funds:
  Collective trust fund:
   13




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
    Thomas & Betts Corporation stock
    fund:
 14




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
  Note 4:
    Investments    2010


2009Number of




Number ofshares/units




shares/unitsor principal




or principalamount

Fair Value


amount

Fair Value(In thousands)Investments at fair value:Thomas & Betts Corporation Stock Fund


1,016


$
15,959
**


1,067


$
12,468
**Vanguard 500 Index Fund


267



30,952
**


284



29,181
**Vanguard Wellington Fund


979



30,440
**


1,033



29,798
**Vanguard Total Bond Market Index Fund


1,663



17,627
**


1,741



18,016
**Vanguard International Growth Fund


764



14,772
**


820



13,937
**Vanguard U.S. Growth Fund


626



11,432



677



11,145
**Vanguard Windsor II Fund


312



8,008



311



7,367Vanguard PRIMECAP Fund


114



7,478



122



7,272Vanguard Explorer Fund


96



6,992



96



5,512Vanguard Extended Market Index Fund


165



6,823



155



5,050Vanguard Capital Opportunity Fund


158



5,248



184



5,526Vanguard Growth Index Fund


37



1,181



45



1,221Vanguard Prime Money Market Fund


463



463



322



322Vanguard Target Retirement 2005 Fund


18



209



12



132Vanguard Target Retirement 2010 Fund


109



2,438



101



2,069Vanguard Target Retirement 2015 Fund


312



3,871



229



2,593Vanguard Target Retirement 2020 Fund


246



5,436



130



2,596Vanguard Target Retirement 2025 Fund


438



5,532



263



2,973Vanguard Target Retirement 2030 Fund


113



2,458



68



1,322Vanguard Target Retirement 2035 Fund


256



3,356



168



1,949Vanguard Target Retirement 2040 Fund


114



2,455



52



984Vanguard Target Retirement 2045 Fund


98



1,316



47



564Vanguard Target Retirement 2050 Fund


34



724



18



351Vanguard Target Retirement Income


584



6,591



535



5,671Vanguard Retirement Savings Trust*


42,000



43,714
**


39,825



40,704
**Total Investments





$
235,475






$
208,723    *
    
    The contract value for the
    Vanguard Retirement Savings Trust was $42.0 million and
    $39.8 million as of December 31, 2010 and 2009,
    respectively.**
    
    Represents 5% or more of the
    Plans net assets. 15




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
     Proceeds





Net RealizedFrom Sales


Cost


Gain (Loss)(In thousands)2010Thomas & Betts Corporation Stock Fund

$
2,792


$
2,253


$
539All other investments


45,704



44,305



1,399$
48,496


$
46,558


$
1,9382009Thomas & Betts Corporation Stock Fund

$
2,438


$
2,663


$
(225
)All other investments


49,606



53,158



(3,552
)$
52,044


$
55,821


$
(3,777
)2008Thomas & Betts Corporation Stock Fund

$
2,172


$
2,176


$
(4
)All other investments


40,526



43,123



(2,597
)$
42,698


$
45,299


$
(2,601
)     Thomas & BettsCorporation Stock


All OtherFund


Investments


Total(In thousands)Balance at December 31, 2007

$
5,106


$
16,094


$
21,200Change in unrealized appreciation (depreciation)


(7,630
)


(45,582
)


(53,212
)Balance at December 31, 2008


(2,524
)


(29,488
)


(32,012
)Change in unrealized appreciation (depreciation)


4,593



31,795



36,388Balance at December 31, 2009


2,069



2,307



4,376Change in unrealized appreciation (depreciation)


3,689



15,274



18,963Balance at December 31, 2010

$
5,758


$
17,581


$
23,339  16




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
    2010


2009


2008(In thousands)Thomas & Betts Corporation Stock Fund

$
4,229


$
4,367


$
(7,634
)Vanguard 500 Index Fund


3,579



5,486



(12,270
)Vanguard Wellington Fund


2,226



4,525



(9,032
)Vanguard Total Bond Market Index Fund


438



273



34Vanguard International Growth Fund


1,780



4,000



(6,028
)Vanguard U.S. Growth Fund


1,092



2,827



(5,312
)Vanguard Windsor II Fund


606



1,401



(3,779
)Vanguard PRIMECAP Fund


708



1,883



(1,273
)Vanguard Explorer Fund


1,453



1,485



(904
)Vanguard Extended Market Index Fund


1,349



1,378



(2,303
)Vanguard Capital Opportunity Fund


497



1,757



(2,727
)Vanguard Growth Index Fund


144



271



(324
)Vanguard Target Retirement 2005 Fund


10



16



(55
)Vanguard Target Retirement 2010 Fund


172



232



(385
)Vanguard Target Retirement 2015 Fund


298



378



(596
)Vanguard Target Retirement 2020 Fund


443



367



(597
)Vanguard Target Retirement 2025 Fund


467



474



(645
)Vanguard Target Retirement 2030 Fund


247



250



(448
)Vanguard Target Retirement 2035 Fund


345



366



(521
)Vanguard Target Retirement 2040 Fund


251



175



(154
)Vanguard Target Retirement 2045 Fund


129



92



(92
)Vanguard Target Retirement 2050 Fund


66



68



(78
)Vanguard Target Retirement Income


372



540



(690
)Net appreciation (depreciation) of fair value of investments

$
20,901


$
32,611


$
(55,813
)    17




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
  Note 5:
    Investment
    Fund Participation    Number ofParticipantsThomas & Betts Corporation Stock Fund


1,071Vanguard 500 Index Fund


1,638Vanguard Wellington Fund


1,226Vanguard Total Bond Market Index Fund


1,093Vanguard International Growth Fund


1,109Vanguard U.S. Growth Fund


869Vanguard Windsor II Fund


647Vanguard PRIMECAP Fund


648Vanguard Explorer Fund


560Vanguard Extended Market Index Fund


503Vanguard Capital Opportunity Fund


374Vanguard Growth Index Fund


192Vanguard Target Retirement 2005 Fund


25Vanguard Target Retirement 2010 Fund


76Vanguard Target Retirement 2015 Fund


165Vanguard Target Retirement 2020 Fund


239Vanguard Target Retirement 2025 Fund


297Vanguard Target Retirement 2030 Fund


292Vanguard Target Retirement 2035 Fund


303Vanguard Target Retirement 2040 Fund


261Vanguard Target Retirement 2045 Fund


223Vanguard Target Retirement 2050 Fund


248Vanguard Target Retirement Income


284Vanguard Retirement Savings Trust


1,629     Note 6:
    Related-Party
    Transactions  party-in-interest
  Note 7:
    Risks and
    Uncertainties     18




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##### Table of Contents



THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
    NOTES TO FINANCIAL
    STATEMENTS  (Continued)
    Note 8:
    Termination    Note 9:
    Income
    Taxes      Note 10:
    Collective
    Trust Funds     19




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##### Table of Contents



Schedule 1
  THOMAS &
    BETTS CORPORATION
    EMPLOYEES INVESTMENT PLAN
  SCHEDULE H,
    LINE 4i  SCHEDULE OF ASSETS (HELD AT END OF
    YEAR)  As of December 31, 2010
  CurrentIdentity of Issue

Description


Value(In thousands)*Thomas & Betts Corporation Stock Fund


1,016 units


$
15,959Mutual Funds and Collective Trust Funds:*Vanguard 500 Index Fund


267 units



30,952*Vanguard Wellington Fund


979 units



30,440*Vanguard Total Bond Market Index Fund


1,663 units



17,627*Vanguard International Growth Fund


764 units



14,772*Vanguard U.S. Growth Fund


626 units



11,432*Vanguard Windsor II Fund


312 units



8,008*Vanguard PRIMECAP Fund


114 units



7,478*Vanguard Explorer Fund


96 units



6,992*Vanguard Extended Market Index Fund


165 units



6,823*Vanguard Capital Opportunity Fund


158 units



5,248*Vanguard Growth Index Fund


37 units



1,181*Vanguard Prime Money Market Fund


463 units



463*Vanguard Target Retirement 2005 Fund


18 units



209*Vanguard Target Retirement 2010 Fund


109 units



2,438*Vanguard Target Retirement 2015 Fund


312 units



3,871*Vanguard Target Retirement 2020 Fund


246 units



5,436*Vanguard Target Retirement 2025 Fund


438 units



5,532*Vanguard Target Retirement 2030 Fund


113 units



2,458*Vanguard Target Retirement 2035 Fund


256 units



3,356*Vanguard Target Retirement 2040 Fund


114 units



2,455*Vanguard Target Retirement 2045 Fund


98 units



1,316*Vanguard Target Retirement 2050 Fund


34 units



724*Vanguard Target Retirement Income


584 units



6,591*Vanguard Retirement Savings Trust


42,000 units



42,000
**Total Funds






233,761*Participant loans, maturity dates ranging from January 2011 to
    June 2021, and interest rates ranging from 4.25% to 10.5%






5,586Total





$
239,347    *
    
    Represents
    parties-in-interest
    with respect to the Plan.**
    
    Valued at contract value as the
    contracts are fully benefit-responsive.  See accompanying report of
    independent registered public accounting firm.
 20




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##### Table of Contents



SIGNATURE  The Plan.
  Thomas & Betts
    Corporation
    Employees Investment Plan
  By:
    /s/  William
    E. Weaver, Jr.  Jr.
 Plan Administrator
  Date: June 27, 2011
 21




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##### Table of Contents



INDEX TO
    EXHIBITS  ExhibitNumber

Description23


Consent of Independent Registered Public Accounting Firm  E-1