Exhibit 3.1

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF

POWER-ONE, INC.

FIRST:                                      The name of the corporation is Power-One, Inc. (hereinafter referred to as the “Corporation”).

SECOND:                The registered office of the Corporation is to be located at 1209 Orange Street, in the City of Wilmington, in the County of New Castle, in the State of Delaware, 19801.  The name of its registered agent at that address is The Corporation Trust Company.

THIRD:                                The purpose of the Corporation is to engage in any lawful act or activity for which a corporation may be organized under the Delaware General Corporation Law.  The Corporation shall have perpetual existence.

FOURTH:               The total number of shares of capital stock that the Company has authority to issue is 1,000 shares, which will be designated common stock, par value $0.001 per share.

FIFTH:                                     The following provisions are inserted for the management of the business and for the conduct of the affairs of the Corporation, and for further definition, limitation and regulation of the powers of the Corporation and of its directors and stockholders:

(1)                    The number of directors of the Corporation shall be such as from time to time shall be fixed by, or in the manner provided in, the by-laws.  Election of directors need not be by ballot unless the by-laws so provide.

(2)                    The Board of Directors shall have powers without the assent or vote of the stockholders to make, alter, amend, change, add to or repeal the by-laws of the Corporation; to fix and vary the amount to be reserved for any proper purpose; to authorize and cause to be executed mortgages and liens upon all or any part of the property of the Corporation; to determine the use and disposition of any surplus or net profits; and to fix the times for the declaration and payment of dividends.

(3)                    The directors in their discretion may submit any contract or act for approval or ratification at any annual meeting of the stockholders or at any meeting of the stockholders called for the purpose of considering any such act or contract, and any contract or act that shall be approved or be ratified by the vote of the holders of a majority of the stock of the Corporation which is represented in person or by proxy at such meeting and entitled to vote thereat (provided that a lawful quorum of stockholders be there represented in person or by proxy) shall be as valid and as binding upon the Corporation and upon all the stockholders as though it had been approved or ratified by every stockholder of the Corporation, whether or not the contract or act would otherwise be open to legal attack because of directors’ interest, or for any other reason.

(4)                    In addition to the powers and authorities hereinbefore or by statute expressly conferred upon them, the directors are hereby empowered to exercise all such powers and do all such acts and things as may be exercised or done by the Corporation; subject, nevertheless, to the provisions of the statutes of Delaware, of this certificate, and to any by-laws from time to time made by the stockholders; provided, however, that no by-laws so made shall invalidate any prior act of the directors which would have been valid if such by-law had not been made.

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SIXTH:                                The Corporation shall, to the full extent permitted by Section 145 of the Delaware General Corporation Law, as the same exists or may hereafter be amended, indemnify all persons whom it may indemnify pursuant thereto.  To the fullest extent permitted by the Delaware General Corporation Law, as the same exists or may hereafter be amended, a director of the Corporation shall not be liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director.  The liability of a director of the Corporation to the Corporation or its stockholders for monetary damages shall be eliminated to the fullest extent permissible under applicable law in the event it is determined that Delaware law does not apply. The Corporation is authorized to provide by bylaw, agreement or otherwise for indemnification of directors, offices, employees and agents for breach of duty to the Corporation and its stockholders in excess of the indemnification otherwise permitted by applicable law.  Any repeal or modification of this Article shall not result in any liability for a director with respect to any action or omission occurring prior to such repeal or modification.

SEVENTH:        Whenever a compromise or arrangement is proposed between the Corporation and its creditors or any class of them and/or between the Corporation and its stockholders or any class of them, any court of equitable jurisdiction within the State of Delaware, may, on the application in a summary way of the Corporation or of any creditor or stockholder thereof or on the application of any receiver or receivers appointed for the Corporation under the provisions of section 291 of Title 8 of the Delaware Code or on the application of trustees in dissolution or of any receiver or receivers appointed for the Corporation under the provisions of section 279 of Title 8 of the Delaware Code order a meeting of the creditors or class of creditors, and/or of the stockholders or class of stockholders of the Corporation, as the case may be, to be summoned in such manner as the said court directs.  If a

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majority in number representing three-fourths in value of the creditors or class of creditors, and/or of the stockholders or class of stockholders of the Corporation, as the case may be, agree to any compromise or arrangement and to any reorganization of the Corporation as consequence of such compromise or arrangement, the said compromise or arrangement and the said reorganization shall, if sanctioned by the court to which the said application has been made, be binding on all the creditors or class of creditors, and/or on all the stockholders or class of stockholders, of the Corporation, as the case may be, and also on the Corporation.

EIGHTH:                     The Corporation reserves the right to amend, alter, change or repeal any provision contained in this certificate of incorporation in the manner now or hereafter prescribed by law, and all rights and powers conferred herein on stockholders, directors and officers are subject to this reserved power.

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