2300 Badger Drive Waukesha, WI 53188-5951 Phone: 877-CPS-INFO (877-277-4636) www.cooperpower.com News Release Contact: Jules Layer (763) 543-7774 Jules.Layer@CooperIndustries.com Latest Version of Cooper Power Systems CYME™ Power Engineering Software Improves Computational & Network Loading Performance New algorithms locate & analyze faults, enhance capacitor placement, & optimize volt/VAR. WAUKESHA, WI, May 16, 2011 – The enhanced Cooper Power Systems CYME™ Version 5.02 Power Engineering Solutions Software now allows engineers to plan more effectively for increased distributed generation penetration, volt/VAR optimization, and aging secondary networks. This latest integrated suite of software tools also includes new algorithms for locating and analyzing faults, enhancing capacitor placement, and balancing load. CYME software provides modeling and analysis of transmission, distribution and industrial electrical networks. This latest version offers improved computational and network loading performance capabilities, faster processing time, and one-line diagram editing. Cooper Power Systems, a division of Cooper Industries, plc (NYSE: CBE), developed the latest enhancements with extensive input from power engineers around the globe to make CYME 5.02 an even more productive and efficient tool to meet emerging needs in grid planning and optimization. By incorporating the comprehensive CYMTCC protective device database (which includes thousands of devices such as circuit breakers, fuses, reclosers and relays, manufactured by more than 100 companies in North America, Europe and Asia), CYME 5.02 makes it possible to perform a wide range of analyses requiring protection data. This software also allows engineers to design protection coordination schemes within a single software package. “The Cyme 5.02 release demonstrates our commitment to continuing to enhance our already best-inclass Smart Grid solutions. This latest release of our system planning software has features that address Smart Grid requirements for transmission down to distribution, and helps utilities address trends around distributed generation, and grid optimization and reliability,” said Mike Stoessl, president of Cooper Power Systems. -More- Cooper Power Systems – Page 2 Since 1986 thousands of power system engineers in more than 200 countries have used CYME software from Cooper Power Systems to plan, design and optimize electrical power networks. For more information or to request a free demonstration, please visit http://www.cooperpower.com. For technical information, call 763-595-7777. About Cooper Power Systems Cooper Power Systems, with 2010 revenues of approximately $1.2 billion, is a division of Cooper Industries plc (NYSE: CBE), and a global manufacturer of world-class power delivery and reliability solutions for the utility, commercial, and industrial markets. Cooper Power Systems is a leading provider of innovative Smart Grid technologies that optimize electrical grid performance. These solutions include Advanced Metering Infrastructure (AMI), Demand Response (DR), Smart Sensors, Power Systems Engineering Software and Services, Substation Automation, and Feeder Automation. The company is also a leading provider of software, communications and integration solutions that enable customers to increase productivity, improve system reliability, and reduce costs. For more information, please visit www.cooperpower.com. About Cooper Industries Cooper Industries plc (NYSE: CBE) is a global electrical products manufacturer with 2010 revenues of $5.1 billion. Founded in 1833, Cooper Industries' sustained success is attributable to a constant focus on innovation, evolving business practices while maintaining the highest ethical standards, and meeting customer needs. The Company has seven operating divisions with leading market positions and worldclass products and brands including: Bussmann electrical and electronic fuses; Crouse-Hinds and CEAG explosion-proof electrical equipment; Halo and Metalux lighting fixtures; and Kyle and McGrawEdison power systems products. With this broad range of products, Cooper Industries is uniquely positioned for several long-term growth trends including the global infrastructure build-out, the need to improve the reliability and productivity of the electric grid, the demand for higher energy-efficient products and the need for improved electrical safety. In 2010 fifty-nine percent of total sales were to customers in the industrial and utility end-markets and thirty-nine percent of total sales were to customers outside the United States. Cooper has manufacturing facilities in 21 countries as of 2010. For more information, visit the website at www.cooperindustries.com. ###