U.S. SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                               ___________________


                                    FORM 11-K


(Mark One)
[ X ] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES AND
      EXCHANGE ACT OF 1934 (No Fee Required)

      For the fiscal year ended December 31, 2003

                                       or

[   ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934 (No Fee Required)

      For  the  transition  period  from  ______________  to  ______________


                         Commission File Number 1-12432


A.  Full title of the plan and the address of the plan, if different from that
    of the issuer named below:

           American Power Conversion Corporation Consolidated 401(k) Plan


B.  Name of issuer of the securities held pursuant to the plan and the address
    of its principal executive office:

                      American Power Conversion Corporation
                              132 Fairgrounds Road
                       West Kingston, Rhode Island  02892


                                        1


                              REQUIRED INFORMATION



A.  Financial Statements and Schedules                               Page

      Report of Independent Registered Public Accounting Firm          5

      Statements of Net Assets Available for Plan Benefits
       as of December 31, 2003 and 2002                                6

      Statements of Changes in Net Assets Available for Plan
       Benefits for the Years Ended December 31, 2003 and 2002         7

      Notes to Financial Statements                                   8-14

      Schedule I  - Schedule of Assets Held for Investment
                    Purposes as of December 31, 2003                   15



B.  Exhibit Listing

      Exhibit
      Number     Description

      23         Consent of Independent Registered Public Accounting Firm 16






                                   SIGNATURES

The Plan.  Pursuant to the requirements of the Securities Exchange Act of 1934,
the trustees (or other persons who administer the employee benefit plan) have
duly caused this annual report to be signed on its behalf by the undersigned
hereunto duly authorized.

         AMERICAN POWER CONVERSION CORPORATION CONSOLIDATED 401(K) PLAN
                                 (Name of Plan)




By: American Power Conversion Corporation, Plan Administrator




By:        /s/ Donald M. Muir
- -------------------------------------------------
Donald M. Muir,
Senior Vice President, Finance and Administration,
and Chief Financial Officer


June 28, 2004



                                        2



                      AMERICAN POWER CONVERSION CORPORATION
                             CONSOLIDATED 401(K) PLAN

                       Financial Statements and Schedules

                           December 31, 2003 and 2002

                   (With Independent Auditors' Report Thereon)


					3



		      AMERICAN POWER CONVERSION CORPORATION
                            CONSOLIDATED 401(K) PLAN
                           December 31, 2003 and 2002


                                Table of Contents



                                      				Page

Report of Independent Registered Public Accounting Firm            5

Statements of Net Assets Available for Plan Benefits               6

Statements of Changes in Net Assets Available for Plan Benefits    7

Notes to Financial Statements                                 8 - 14

Schedule

1 Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  15

Note:  Certain  schedules as required by Section 103(b)(3) of  the  Employee
Retirement  Income Security Act of 1974, have not been included  herein  as  the
information is not applicable.



					4









             Report of Independent Registered Public Accounting Firm


The Consolidated 401(k) Plan Committee
American Power Conversion Corporation:

We  have  audited the accompanying statements of net assets available  for  plan
benefits  of the American Power Conversion Corporation Consolidated 401(k)  Plan
(the  Plan)  as  of  December 31, 2003 and 2002, and the related  statements  of
changes  in  net  assets available for plan benefits for the years  then  ended.
These financial statements are the responsibility of the Plan's management.  Our
responsibility is to express an opinion on these financial statements  based  on
our audits.

We  conducted  our  audits in accordance with standards of  the  Public  Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on  a
test  basis,  evidence supporting the amounts and disclosures in  the  financial
statements. An audit also includes assessing the accounting principles used  and
significant  estimates  made by management, as well as  evaluating  the  overall
financial  statement  presentation.  We  believe  that  our  audits  provide   a
reasonable basis for our opinion.

In  our  opinion, the financial statements referred to above present fairly,  in
all  material  respects,  the net assets available  for  plan  benefits  of  the
American   Power  Conversion  Corporation  Consolidated  401(k)   Plan   as   of
December  31,  2003 and 2002, and the changes in net assets available  for  plan
benefits  for  the  years then ended, in conformity with  accounting  principles
generally accepted in the United States of America.

Our  audits  were  made  for the purpose of forming  an  opinion  on  the  basic
financial statements taken as a whole. The supplemental Schedule of Assets (Held
at End of Year) is presented for the purpose of additional analysis and is not a
required   part   of  the  basic  financial  statements,  but  is  supplementary
information  required  by the Department of Labor's Rules  and  Regulations  for
Reporting  and Disclosure under the Employee Retirement Income Security  Act  of
1974. This supplemental schedule is the responsibility of the Plan's management.
The  supplemental schedule has been subjected to the auditing procedures applied
in  the audit of the basic financial statements as of December 31, 2003, and  in
our  opinion, is fairly stated in all material respects in relation to the basic
financial statements taken as a whole.


					/s/ KPMG LLP




Providence, Rhode Island
May 28, 2004

					5





		      AMERICAN POWER CONVERSION CORPORATION
                            CONSOLIDATED 401(K) PLAN

		Statements of Net Assets Available for Plan Benefits

			   December 31, 2003 and 2002



                                                   	      2003         2002
                                                                
Cash                                       	           $34,600       $8,113
Receivables:
  Employer's contribution                                  290,119      214,376
  Accrued income                                            30,016       29,341
  Participants' contributions                                    -       12,675

                                                           354,735      264,505

Investments (note 3):
  American Power Conversion Corporation common stock   145,042,318   14,654,355
  Investments in common/collective trusts:
     Merrill Lynch Equity Index Trust 1      		 3,347,376    1,771,796
     Merrill Lynch Retirement Preservation Trust  	 3,347,726    2,077,141

                                           	       151,737,420   18,503,292


  Mutual Funds:
     Merrill Lynch Equity Dividend Fund Class 1          2,618,186    1,491,132
     Merrill Lynch Fundamental Growth Class 1   	 4,059,880    2,416,310
     Massachusetts Investors Growth Stock Fund Class A   3,262,392    2,065,983
     Pimco Total Return Fund Class A       		 2,675,646    1,593,483
     MFS New Discovery Fund Class A        		 2,831,099    1,419,109
     Ariel Fund                            		 2,563,063      828,599
     Templeton Foreign Fund                		 2,865,631    1,564,861
     Merrill Lynch Basic Value Fund Class 1   		 4,249,914    2,471,324

                                               		25,125,811   13,850,801

   Loans to participants                      		 1,269,204      677,545

             Total investments                         178,132,435   33,031,638
             Net assets available for plan benefits   $178,487,170  $33,296,143




See accompanying notes to financial Statements.



					6







		      AMERICAN POWER CONVERSION CORPORATION
                            CONSOLIDATED 401(K) PLAN

	   Statements of Changes in Net Assets Available for Plan Benefits

		      Years ended December 31, 2003 and 2002



							     2003         2002
                                                 	           

Additions (deductions) to net assets attributed to:
  Investment income (loss):
     Net realized gains (losses)                       $4,479,224     $(523,374)
     Net unrealized gains (losses)                     50,812,366    (2,168,044)
     Interest                                              48,850        45,001
     Dividends                                            971,284       354,523

                                                       56,311,724    (2,291,894)
 Contributions:
     Participants                                       6,993,274     5,849,578
     Employer                                           3,754,420     3,256,767

                                                       10,747,694     9,106,345

 Transfers in (note 1)                                 83,333,837             -

             Total additions                          150,393,255     6,814,451

Deductions from net assets attributed to:
  Distributions paid to participants                    5,196,842     2,200,626
             Total deductions                           5,196,842     2,200,626
             Net increase prior to other              145,196,413     4,613,825

Other                                                      (5,386)      (14,680)

             Net increase in net assets available
                 for benefits                         145,191,027     4,599,145

Net assets available for benefits:
 Beginning of year                                     33,296,143    28,696,998

 End of year                                         $178,487,170   $33,296,143



See accompanying notes to financial statements.



					7


		      AMERICAN POWER CONVERSION CORPORATION
                            CONSOLIDATED 401(K) PLAN

		          Notes to Financial Statements

			   December 31, 2003 and 2002



 (1) Description of Plan

   The  following brief description of the American Power Conversion Corporation
   Consolidated  401(k)  Plan  (the  Plan) provides  only  general  information.
   Participants  should  refer  to  the  Plan  agreement  for  a  more  complete
   description of the Plan's provisions.

   In  December 2002, the board of directors of the Company voted to  merge  the
   assets  of the American Power Conversion Employee Stock Ownership Plan (ESOP)
   into  the  American Power Conversion Corporation 401(k) Plan during the  2003
   Plan  year.  During May 2003, the participants of the ESOP were  notified  of
   the  anticipated  merger. On July 1, 2003, the assets of  the  ESOP  totaling
   $83,333,837 were transferred to the Plan.

   Effective  July  1, 2003, the Company amended and restated the  Plan  in  its
   entirety  to  reflect  the merger of the ESOP and renamed  the  Plan  as  the
   American Power Conversion Corporation Consolidated 401(k) Plan.

    (a) General

       The  Plan  is  a  qualified defined contribution plan  covering  American
       Power  Conversion Corporation (the Company) employees who have  completed
       at  least  30 days of service with the Company. The Plan covers all  U.S.
       employees  working for the Company and the Participating Affiliates,  APC
       America,  Inc.,  APC  Sales and Service Corporation, Systems  Enhancement
       Corporation,  APC  DC Network Solutions, Inc. and ABL  Electronics  Corp.
       The  Plan is subject to the provisions of the Employee Retirement  Income
       Security Act of 1974 (ERISA).

    (b) Contributions

       An  employee may elect to contribute pre-tax savings subject to a maximum
       of  80% of annual compensation or the dollar limit established by the IRS
       ($12,000  for  2003 and $11,000 for 2002), whichever is  less.  In  2003,
       contributions  were also limited to a maximum of 15% of compensation  per
       pay  period. The Company may match this salary savings contribution at  a
       rate  of  up to 100% of the first 3%, and up to 50% of the next 3% of the
  	 participant's  salary  and  bonus  compensation, excluding commissions,
	 incentive  compensation, taxable fringe benefits, moving expenses, auto
	 and other allowances, and disqualifying dispositions of Company stock.  A
       maximum  of  6%  per  participant contributions are subject  to  employer
       match.   The   Company   may   also  make  discretionary   profit-sharing
       contributions  to  the  Plan.  All employer matching  and  profit-sharing
       contributions are deposited to the American Power Conversion  Corporation
       Common  Stock  Fund. Additional deferrals, "catch-up contributions",  are
       available  for eligible participants aged 50 or over at the  end  of  the
       Plan   year  ($2,000  for  2003  and  $1,000  for  2002).  The   catch-up
       contributions are not eligible for 401(k) matching.

       There were no discretionary contributions made for the 2003 or 2002  Plan
       year.


					8


    (c) Vesting

       Participants  are  fully  vested to the extent of  their  salary  savings
       contributions  and  earnings  on  those contributions.  Participants  are
       immediately  vested in employer matching contributions  and  the  related
       earnings. However, any discretionary (profit-sharing) contributions  vest
       on  a schedule of 25% after 2 years of service, and an additional 25% per
       year thereafter until 100% vesting is reached after 5 years of service.

    (d) Loans to Participants

       Participants  may borrow from their vested account balance under  certain
       circumstances as provided in the Plan agreement. The minimum loan  amount
       is  $1,000 and participants may borrow the lesser of 50% of their  vested
       account  balance  or  $50,000.  Interest  on  loans  is  charged  at  the
       prevailing  commercial interest rate for loans of a similar  type  (prime
       plus  1%)  with a repayment term not to exceed five years. This term  can
       be  extended  if  the loan is used for the purchase of the  participant's
       primary  residence.  A  participant may  not  have  more  than  one  loan
       outstanding at any time.

    (e) Payment of Account Balances

       Upon  termination from the Plan, a participant's vested  accrued  balance
       in  his  or  her  account  shall be distributed,  as  a  single  lump-sum
       payment. Distributions may also be made in cash or in kind, or part  cash
       and part in kind.

    (f) Hardship Withdrawal

       The  Plan provides for hardship withdrawals, as defined by the Plan, from
       the  participant's  account. Participants who take a hardship  withdrawal
       must  be suspended from contributing to the Plan for a period of 6 months
       following the date of the withdrawal.

    (g) Forfeitures

       Prior  to  the  merger  of  the  ESOP and Plan,  forfeitures  related  to
       discretionary  contributions were allocated to remaining participants  in
       the  succeeding  plan  year in the ratio that the  compensation  of  each
       participant  for  the  plan year bears to the total compensation  of  all
       participants  entitled  to  share in the contributions  so  long  as  the
       forfeiture   allocation   group   meets   the   requirements   of    Code
       Section  410(b).  If the forfeiture allocation group does  not  meet  the
       requirements  of  Code  Section 410(b), then the trustee  shall  allocate
       nonhighly compensated participants in the forfeiture allocation group  an
       amount  in the ratio that such compensation of each nonhighly compensated
       participant  in  the  group  bears  to  the  total  compensation  of  all
       nonhighly  compensated participants. No forfeiture allocations  are  made
       to highly compensated employees.

       Subsequent  to the merger of the ESOP and Plan, forfeitures are  utilized
       to:  (i)  reinstate  previously  forfeited  account  balances  of  former
       participants;  (ii)   satisfy administrative expenses; and  (iii)  reduce
       subsequent company contributions.


					9



(2) Summary of Significant Accounting Policies

    (a) Basis of Presentation

       The  accompanying  financial statements of the Plan  have  been  prepared
       using  the  accrual  basis  of accounting in accordance  with  accounting
       principles generally accepted in the United States of America.

       The  preparation  of financial statements in conformity  with  accounting
       principles  generally accepted in the United States of  America  requires
       estimates and assumptions that affect the reported amounts of assets  and
       liabilities  and disclosure of contingent assets and liabilities  at  the
       date  of  the financial statements and the reported amounts of  additions
       and  deductions  to  net assets available for plan  benefits  during  the
       reporting period. Actual results could differ from those estimates.

    (b) Investments

       Investments are stated at aggregate fair market values. Loans are  valued
	 at  cost, which approximates fair value. Quoted market prices are used to
       value investments.

       Purchases  and  sales of securities are recorded on a  trade-date  basis.
       Dividends are recorded on the ex-dividend date.


    (c) Expenses

       All  expenses of the Plan are paid by the Company in accordance with  the
       Plan  agreement, with the exception of loan set-up fees, which  are  paid
       by   each  participant  receiving  a  loan,  and  are  paid  out  of  the
       participant's  account.  In  2003 and 2002, administrative  expenses  are
       included  in the "Statement of Changes in Net Assets Available  for  Plan
       Benefits" under the heading "Other".

    (d) Payment of Account Balances

       Distributions are recorded when paid.

					10



(3) Investments

   The  Plan's  investments  are held in trust and  managed  by  Merrill  Lynch.
   Participants may direct employer and employee contributions into any  of  the
   investment   options  listed  below.  The  following  table  summarizes   the
   investments  held by Merrill Lynch at December 31, 2003 and 2002. Investments
   representing  5%  or  more  of net assets available  for  plan  benefits  are
   indicated by an asterisk (*).




                                       2003               	 2002
                             Number of     Fair Market  Number of    Fair Market
                               shares         value       shares        value
			    		 	                
American Power Conversion
 Corporation common stock
 (note 4)                    5,920,095    $145,042,318*   967,284   $14,654,355*
Merrill Lynch Equity Index
 Trust 1                        41,644       3,347,376     28,281     1,771,796*
Merrill Lynch Retirement
 Preservation Trust          3,347,726       3,347,726  2,077,141     2,077,141*
Merrill Lynch Fundamental
 Growth Fund Class 1           245,162       4,059,880    187,166     2,416,310*
Pimco Total Return Fund
 Class A                       249,827       2,675,646    149,342     1,593,483
MFS New Discovery Fund
 Class A		       184,436       2,831,099    124,157     1,419,109
Ariel FUnd                      56,805       2,563,063     23,513       828,599
Merrill Lynch Equity
 Dividend Fund Class 1         208,123       2,618,186    147,345     1,491,132
Templeton Foreign Fund         269,326       2,865,631    188,311     1,564,861
Massachusetts Investors
 Growth Stock Fund Class A     288,197       3,262,392    223,833     2,065,983*
Merrill Lynch Basic Value
 Fund Class A                  139,068       4,249,914    105,793     2,471,324*





   A brief description of each current fund's investment objective follows:

       Merrill  Lynch Equity Index Trust 1 invests primarily in a  portfolio  of
       equity  securities  designed  to match the performance  of  the  S&P  500
       Index.

       Merrill   Lynch   Retirement  Preservation   Trust   seeks   to   provide
       preservation  of capital, liquidity, and current income  at  levels  that
       are typically higher than those provided by money market funds.

       Merrill  Lynch  Equity Dividend Fund Class 1 provides  shareholders  with
       long-term  total return by investing primarily in a diversified portfolio
       of  dividend-paying common stocks that yield more than the S&P 500 Index.
       Total return is the aggregate of income and capital value changes.

       Merrill  Lynch Fundamental Growth Fund Class 1 seeks long-term growth  of
       capital  by  investing in a diversified portfolio of  equity  securities,
       placing  particular  emphasis on companies  that  have  exhibited  above-
       average growth rates in earnings.

					11


       Massachusetts Investors Growth Stock Fund Class A seeks to provide  long-
       term growth of capital and future income rather than current income.  The
       fund  may  invest  up  to 50% of its total assets in foreign  securities,
       including securities of issuers located in developing markets.

       Merrill  Lynch  Basic Value Fund Class 1 seeks capital appreciation,  and
       secondarily,  income, by investing primarily in equities that  appear  to

       be undervalued.

       Templeton Foreign Fund seeks to achieve long-term capital growth  through
       a  flexible  policy  of investing in the equity and  debt  securities  of
       companies  and  governments outside the U.S. Although the Fund  primarily
       invests  in  common  stocks, it also may invest in preferred  stocks  and
       certain debt securities, rated or unrated.

       Pimco  Total  Return  Fund  Class  A  seeks  to  maximize  total  return,
       consistent   with   preservation  of  capital  and   prudent   investment
       management. Under normal circumstances, the Fund invests at least 65%  of
       its  total  assets in a diversified portfolio of fixed-income  securities
       of varying maturities.

       MFS  New  Discovery Fund Class A seeks capital appreciation by  investing
       at  least 65% of its total assets in U.S. or foreign companies that  Fund
       management believes offer superior prospects for growth.

       Ariel   Fund  seeks  long-term  capital  appreciation  by  investing   in
       companies with market capitalization primarily under $1.5 billion at  the
       time of investment, with an emphasis on small-cap stocks.

   American  Power  Conversion  Corporation common  stock  is  offered  to  Plan
   participants as an additional investment option. Merrill Lynch purchases  the
   shares  in  the open market at the time employee contributions are  received.
   The  timing  of  all  stock transactions is subject to  the  availability  of
   American  Power Conversion Corporation common stock on the open  market,  and
   prices are set by the market.

(4) Nonparticipant-Directed Investments

   The  employer matching contribution is entirely directed to purchasing shares
   of  common  stock  of  American Power Conversion  Corporation.  However,  the
   participant may reallocate this investment to any of the other funds  in  the
   Plan   restricted  only  by  the  closed  employee  stock  trading   periods.
   Furthermore,  employees  may  elect  to direct  a  portion  of  their  401(k)
   contribution  towards  purchasing shares of common stock  of  American  Power
   Conversion Corporation.


					12


   Information  about the net assets and the components of the  changes  in  net
   assets  relating  to  shares  of common stock of  American  Power  Conversion
   Corporation and the related employer contribution receivable is as follows:




                                                          December 31,
                                                     2003             2002
					       		 
Net assets:
  American Power Conversion Corporation

   common stock					$145,332,595      $14,869,402

Changes in net assets:
  Contributions                                   $4,358,652       $3,871,791
  Net realized (losses) gains                      4,249,188          (92,095)
  Net unrealized gains                            46,116,530        1,131,590
Benefits paid to participants                     (3,860,797)        (834,268)
Interest on outstanding participant loans              7,903            6,528
Dividends                                            625,171                -
Other                                                   (485)               -
Net interfund transfer out                        (4,451,265)      (1,075,837)
Transfer in from ESOP                             83,333,837                -
Loan repayments                                       84,459           50,499
              Increase in net assets            $130,463,193       $3,058,208





(5) Plan Termination

   Although it has not expressed any intent to do so, the Company has the  right
   under  the Plan to discontinue its contributions at any time and to terminate
   the  Plan  subject  to  the  provisions  of  ERISA.  In  the  event  of  Plan
   termination, participants will be fully vested in their accounts.

(6) Tax Status

   The  Internal  Revenue Service has determined and informed the Company  by  a
   letter  dated  September  30,  2003, that the  Plan  and  related  trust  are
   designed in accordance with applicable sections of the Internal Revenue  Code
   (IRC).

(7) Related-Party Transactions

   Certain  Plan  investments  are shares of mutual  funds  managed  by  Merrill
   Lynch.  Merrill  Lynch is the trustee as defined by the Plan and,  therefore,
   these transactions qualify as party-in-interest transactions.

					13



(8) Realized/Unrealized Gains and Losses

   Net  realized and unrealized gains (losses) by investment type for  the  year
   ended December 31, 2003 and 2002 were comprised of the following:



                                         2003                      2002
                                 Realized    Unrealized    Realized    Unrealized
                                                          
Common stocks                  $4,249,188   $46,116,530    $(92,095)   $1,131,590
Common/collective trusts           16,910       628,797    (400,551)     (395,003)
Mutual funds                      213,126     4,067,039     (30,728)   (2,904,631)

          Total                $4,479,224   $50,812,366   $(523,374)  $(2,168,044)


					14



								       SCHEDULE 1


			AMERICAN POWER CONVERSION CORPORATION
                         CONSOLIDATED 401(K) PLAN

	    Schedule H, Line 4i - Schedule of Assets (Held at End of Year)

				  December 31, 2003



Identity of issuer,
 borrower, lessor,                                                  		  Current
 or simialar party          Description of Investment	              Cost         Value

                                                                    
*American Power COnversion
  Corp.                      Common Stock                        $34,054,586  $145,042,318
*Merrill Lynch               Equity Index Trust 1                  2,718,580     3,347,376
*Merrill Lynch               Retirement Preservation Trust         3,347,726     3,347,726
*Merrill Lynch               Fundamental Growth Fund Class 1       3,276,466     4,059,880
  Massachusetts              Investors Growth Stock Fund Class A   2,763,115     3,262,392
  Templeton                  Foreign Fund                          2,328,507     2,865,631
  Pimco                      Total Return Fund Class A             2,686,801     2,675,646
  MFS                        New Discovery Fund Class A            2,266,074     2,831,099
  Ariel                      Ariel Fund                            2,175,613     2,563,063
*Merrill Lynch               Basic Value Fund Class 1              3,371,818     4,249,914
*Merrill Lynch               Equity Dividend Fund Class 1          2,173,762     2,618,186

*Loans to participants       Various loans with interst rates
  (201 loans)                 of 5.00% to 10.5%                            -     1,269,204

                                                                              $178,132,435


*Indicates a party-in-interest to the Plan.



See accompanying independent auditors' report.

					15





                                                                    Exhibit 23



		CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM




The Board of Directors
American Power Conversion Corporation:

We consent to the incorporation by reference in the
registration statements (Nos. 33-25873, 33-54416, 333-32563,
333-78595, 333-80541, 333-80569 and 333-91994) on Form S-8
and (No. 333-107559) on Form S-3 of American Power
Conversion Corporation of our report dated May 28, 2004,
relating to the statements of net assets available for plan
benefits of the American Power Conversion Corporation Consolidated
401(k)Plan as of December 31, 2003 and 2002, and the related
statements of changes in net assets available for plan
benefits for the years then ended, and the related
supplementary schedule, which report appears in the December
31, 2003 annual report on Form 11-K of the American Power
Conversion Corporation Consolidated 401(k) Plan.

                         /s/ KPMG LLP

Providence, Rhode Island
June 25, 2004


					16