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