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Liebert PSI XR series is a feature-rich UPS Uninterrupted Power Supply - this devices sit between computer equipment and it's power source and contains a battery that is continually charged, if power is lost (i.e. during a power cut) the UPS takes over powering the equipment for a... system designed especially for today's IT applications such as servers, storage, and networking equipment. Its high power output delivers superior performance on power factor corrected (PFC) power supply and satisfactory backup time in the high demand environment.