Vertiv Liebert PSI5 is a compact rackmount or tower, AVR line-interactive UPS system designed especially for IT applications such as network closets and small data centers. The Vertiv Liebert PSI5 UPS supports advanced pure sine wave output on battery to safeguard critical IT equipment and business electronics. It also provides reliable power protection for servers, critical nodes, network workstations, large network peripherals, network routers, bridges, and other electronic equipment.