Mitsubishi 9900B Series UPS, true online double conversion system available in 300kVA to 750kVA, this system deliveres as much as 97% system efficiency at unit power factor. This inproved power usage effectiveness substantially reduces operationg and cooling costs compared to conventional UPS, and features IGBT technology for enhanced UPS performance and reliability. 3 Level Power Conversion technology, dual input, available for parallel redundant & capacity applications (up to 8 modules), board level self diagnostics; voltage option: 480V, output 480V