Filed by Cooper Industries plc

pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-6(b)

under the Securities Exchange Act of 1934

Subject Company: Cooper Industries plc; Eaton Corporation

Filer’s SEC File No.: 1-31330

Date: October 5, 2012

Answering Machine Message

Hello. This message is from D.F. King & Co., Inc. regarding your investment in Cooper Industries PLC.  You should have received proxy materials concerning the upcoming shareholder meetings relating to the transaction between Cooper and Eaton Corporation.

On October 26, 2012, Cooper Industries will hold its Special Court-Ordered Meeting as well as its Extraordinary General Meeting relating to the transaction.  You will have the opportunity to vote on the Proposal to approve the scheme of arrangement at the Cooper Court-Ordered Meeting and 7 Resolutions at the Extraordinary General Meeting.

The board of directors of Cooper recommends that Cooper shareholders vote FOR the Proposal to approve the scheme of arrangement at the Cooper Court-Ordered Meeting and vote FOR Resolutions 1 through 7 at the Cooper Extraordinary General Meeting.

Please review the materials mailed to you and cast your vote by telephone or via the internet in accordance with the instructions on the voting form. You may also mark, sign, date and promptly mail the voting instruction form in the postage paid envelope provided. Please act as soon as possible so your shares can be represented at the meeting.

If you have questions or need assistance in voting your shares, please call D.F. KING, the information agent, at 1-800-859-8508.

Thank you.

No Offer or Solicitation

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote or approval in any jurisdiction pursuant to the acquisition or otherwise, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

Important Additional Information Has Been and Will be Filed with the SEC

A registration statement on Form S-4 has been filed with the SEC, which includes the Joint Proxy Statement of Eaton and Cooper that also constitutes a Prospectus of Eaton Corporation plc⁽¹⁾. The registration statement was declared effective on September 7, 2012. Eaton and Cooper have commenced sending to their respective shareholders (and to Cooper equity award holders for information only) the definitive Joint Proxy Statement/Prospectus (including the Scheme) in connection with the transaction. Investors and shareholders are urged to read the definitive Joint Proxy Statement/Prospectus (including the Scheme) and other relevant documents filed or to be filed with the SEC carefully because they contain or will contain important information about Eaton, Cooper, Eaton Corporation plc, the transaction and related matters. Investors and security holders may obtain free copies of the definitive Joint Proxy Statement/Prospectus (including the Scheme) and other documents filed with the SEC by Eaton Corporation plc, Eaton and Cooper through the website maintained by the SEC at www.sec.gov. In addition, investors and shareholders may obtain free copies of the definitive Joint Proxy Statement/Prospectus (including the Scheme) and other documents filed by Eaton and Eaton Corporation plc with the SEC by contacting Eaton Investor Relations at Eaton Corporation, 1111 Superior Avenue, Cleveland, Ohio 44114 or by calling (888) 328-6647, and may obtain free copies of the definitive Joint Proxy Statement/Prospectus (including the Scheme) and other documents filed by Cooper by contacting Cooper Investor Relations at c/o Cooper US, Inc., P.O. Box 4466, Houston, Texas 77210 or by calling (713) 209-8400.

⁽¹⁾ Currently named Eaton Corporation Limited but expected to be re-registered as Eaton Corporation plc prior to the consummation of the transaction.

Forward-Looking Statements

This communication may contain forward-looking statements concerning the transaction, our long-term credit rating and our revenues and operating earnings. These statements or disclosures may discuss goals, intentions and expectations as to future trends, plans, events, results of operations or financial condition, or state other information relating to Cooper, based on current beliefs of management as well as assumptions made by, and information currently available to, management. Forward-looking statements generally will be accompanied by words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “forecast,” “guidance,” “intend,” “may,” “possible,” “potential,” “predict,” “project” or other similar words, phrases or expressions. These statements should be used with caution. They are subject to various risks and uncertainties, many of which are outside of our control. Factors that could cause actual results to differ materially from those in the forward-looking statements include adverse regulatory decisions; failure to satisfy other closing conditions with respect to the Transaction; the risks that the new businesses will not be integrated successfully or that we will not realize estimated cost savings and synergies; unanticipated changes in the markets for our business segments; unanticipated downturns in business relationships with customers or their purchases from Cooper; competitive pressures on our sales and pricing; increases in the cost of material, energy and other production costs, or unexpected costs that cannot be recouped in product pricing; the introduction of competing technologies; unexpected technical or marketing difficulties; unexpected claims, charges, litigation or dispute resolutions; new laws and governmental regulations, including changes in tax laws, tax treaties or tax regulations. We do not assume any obligation to update these forward-looking statements.

Statement Required by the Takeover Rules

The directors of Cooper accept responsibility for the information contained in this communication. To the best of the knowledge and belief of the directors of Cooper (who have taken all reasonable care to ensure that such is the case), the information contained in this communication is in accordance with the facts and does not omit anything likely to affect the import of such information.

Persons interested in 1 percent or more of any relevant securities in Eaton or Cooper may from the date of this communication have disclosure obligations under rule 8.3 of the Irish Takeover Panel Act, 1997, Takeover Rules 2007 (as amended).