The 9900AEGIS is the smallest in the popular 9900 series UPS from Mitsubishi Electric. Like all other Mitsubishi Electric UPSs, the AEGIS™ is a three-phase, on-line double-conversion system and features Mitsubishi Electric's world-renowned 3 Level Insulated Gate Bipolar Transistor (IGBT) technology for enhanced UPS performance and reliability. The AEGIS™ series is available in 80, 100, 150, 160, and 225 kVA and is UL924 listed (Standard for Emergency Lighting). One of the outstanding features of the AEGIS™ is that it boasts a relatively flat efficiency curve indicating that the UPS is highly efficient regardless of the load. This is significant since loads in various data centers can range anywhere from 25% to nearly 100%. The AEGIS™ can be configured both as a single module or in multi-module systems up to 4 units.