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, 2007, 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 12th day ofFebruary 2008.         /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, 2007, 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 12th day ofFebruary 2008.         /s/ Robert M. Devlin   Robert M. Devlin      
 

 
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, 2007, 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 12th day ofFebruary 2008.         /s/ Ivor J. Evans   Ivor J. Evans      
 

 
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, her 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 her name and in her 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, 2007, 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 her hand this 12th day ofFebruary 2008.              /s/ Linda A. Hill   Linda A. Hill      
 

 
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, 2007, 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 12th day ofFebruary 2008.              /s/ Lawrence D. Kingsley   Lawrence D. Kingsley      
 

 
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, 2007, 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 12th day ofFebruary 2008.              /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, 2007, 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 12th day ofFebruary 2008.              /s/ Dan F. Smith   Dan F. 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 supplementalthereto, with respect to the fiscal year ended December 31, 2007, 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 12th day ofFebruary 2008.         /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 supplementalthereto, with respect to the fiscal year ended December 31, 2007, 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 12th day ofFebruary 2008.              /s/ Mark S. Thompson   Mark S. Thompson      
 

 
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, 2007, 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 12th day ofFebruary 2008.              /s/ James R. Wilson   James R. Wilson