Exhibit 24.0POWER OF ATTORNEYCOOPER INDUSTRIES, LTD.     KNOW ALL MEN BY THESE PRESENTS, that the undersigned director or officer of Cooper Industries,Ltd. (“Cooper”), a Bermuda corporation, does hereby make, constitute and appoint Kevin M. McDonaldand Terrance V. Helz, and each of them acting individually, his true and lawful attorney with powerto act without the other and with full power of substitution, to execute, deliver and file, for andon behalf of the undersigned, and in his name and in his capacity or capacities as aforesaid, theCooper Annual Report on Form 10-K with the Securities and Exchange Commission under the SecuritiesExchange Act of 1934, as amended, and any other documents in support thereof or supplementalthereto, with respect to the fiscal year ended December 31, 2006, and any and all amendmentsthereto. The undersigned hereby grants to said attorneys and each of them full power and authorityto do and perform each and every act and thing whatsoever as said attorney or attorneys may deemnecessary or advisable to carry out fully the intent of the foregoing as the undersigned might orcould do personally or in the capacity or capacities as aforesaid, hereby ratifying and confirmingall acts and things which said attorney or attorneys may do or cause to be done by virtue of thesepresents.     IN WITNESS WHEREOF, the undersigned has hereunto set his hand this 13th day of February 2007.                                    /s/ Stephen G. Butler   Stephen G. Butler      
 

 
POWER OF ATTORNEYCOOPER INDUSTRIES, LTD.     KNOW ALL MEN BY THESE PRESENTS, that the undersigned director or officer of Cooper Industries,Ltd. (“Cooper”), a Bermuda corporation, does hereby make, constitute and appoint Kevin M. McDonaldand Terrance V. Helz, and each of them acting individually, his true and lawful attorney with powerto act without the other and with full power of substitution, to execute, deliver and file, for andon behalf of the undersigned, and in his name and in his capacity or capacities as aforesaid, theCooper Annual Report on Form 10-K with the Securities and Exchange Commission under the SecuritiesExchange Act of 1934, as amended, and any other documents in support thereof or supplementalthereto, with respect to the fiscal year ended December 31, 2006, and any and all amendmentsthereto. The undersigned hereby grants to said attorneys and each of them full power and authorityto do and perform each and every act and thing whatsoever as said attorney or attorneys may deemnecessary or advisable to carry out fully the intent of the foregoing as the undersigned might orcould do personally or in the capacity or capacities as aforesaid, hereby ratifying and confirmingall acts and things which said attorney or attorneys may do or cause to be done by virtue of thesepresents.     IN WITNESS WHEREOF, the undersigned has hereunto set his hand this 13th day ofFebruary 2007.                                     /s/      James J. Postl   James J. Postl      
 

 
POWER OF ATTORNEYCOOPER INDUSTRIES, LTD.     KNOW ALL MEN BY THESE PRESENTS, that the undersigned director or officer of Cooper Industries,Ltd. (“Cooper”), a Bermuda corporation, does hereby make, constitute and appoint Kevin M. McDonaldand Terrance V. Helz, and each of them acting individually, his true and lawful attorney with powerto act without the other and with full power of substitution, to execute, deliver and file, for andon behalf of the undersigned, and in his name and in his capacity or capacities as aforesaid, theCooper Annual Report on Form 10-K with the Securities and Exchange Commission under the SecuritiesExchange Act of 1934, as amended, and any other documents in support thereof or supplementalthereto, with respect to the fiscal year ended December 31, 2006, and any and all amendmentsthereto. The undersigned hereby grants to said attorneys and each of them full power and authorityto do and perform each and every act and thing whatsoever as said attorney or attorneys may deemnecessary or advisable to carry out fully the intent of the foregoing as the undersigned might orcould do personally or in the capacity or capacities as aforesaid, hereby ratifying and confirmingall acts and things which said attorney or attorneys may do or cause to be done by virtue of thesepresents.     IN WITNESS WHEREOF, the undersigned has hereunto set his hand this 13th day ofFebruary 2007.                                     /s/      Gerald B. Smith   Gerald B. Smith      
 

 
POWER OF ATTORNEYCOOPER INDUSTRIES, LTD.     KNOW ALL MEN BY THESE PRESENTS, that the undersigned director or officer of Cooper Industries,Ltd. (“Cooper”), a Bermuda corporation, does hereby make, constitute and appoint Kevin M. McDonaldand Terrance V. Helz, and each of them acting individually, his true and lawful attorney with powerto act without the other and with full power of substitution, to execute, deliver and file, for andon behalf of the undersigned, and in his name and in his capacity or capacities as aforesaid, theCooper Annual Report on Form 10-K with the Securities and Exchange Commission under the SecuritiesExchange Act of 1934, as amended, and any other documents in support thereof or supplemental thereto, with respect to the fiscal year endedDecember 31, 2006, and any and all amendments thereto. The undersigned hereby grants to saidattorneys and each of them full power and authority to do and perform each and every act and thingwhatsoever as said attorney or attorneys may deem necessary or advisable to carry out fully theintent of the foregoing as the undersigned might or could do personally or in the capacity orcapacities as aforesaid, hereby ratifying and confirming all acts and things which said attorney orattorneys may do or cause to be done by virtue of these presents.     IN WITNESS WHEREOF, the undersigned has hereunto set his hand this 13th day of February 2007.                                     /s/      James R. Wilson   James R. Wilson      
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