The Liebert GXT4 is a compact, online uninterruptible power system (UPS) that continuously conditions and regulates its output voltage. The UPS is designed to supply microcomputers and other sensitive electronic equipment with clean sine wave input power. Upon generation, AC power is clean and stable. However, during transmission and distribution it is subject to voltage sags, spikes and complete failure that may interrupt computer operations, cause data loss and damage equipment. The Liebert GXT4 protects equipment from these disturbances. The Liebert GXT4 continuously charges its batteries from the mains, making it possible to supply power to the connected loads, even if the mains fail.