High performance UPS upgradeable from 4 kVA to 20 kVA. Can be used for 20 to 110 servers, ideal for: departmental networks, servers and workstations. 4/ 5/ 8/ 10/ 15/ 20 kVA ( 3/ 16U) True On Line 0.9 PF Modular UPS Hot Swappable Modules 2 Load segments USB and RS232 ports