The Eaton 9PX 3000i is a double-conversion online UPS rated at 3000VA, part of Eaton's 9PX line aimed at protecting servers, networking equipment and other critical infrastructure with the highest tier of power protection — online double-conversion designs regenerate a clean output waveform continuously rather than only switching to battery when mains fails, giving connected equipment zero transfer time and full isolation from mains disturbances (sags, surges, frequency variation). The "RT3U" designation indicates a rack/tower convertible design in a 3U form factor, letting it be deployed either as a freestanding unit or mounted into a standard server rack. This tier of UPS is standard equipment for server rooms and data centre racks. Exact runtime at full load and network card inclusion aren't detailed in this listing, so confirm those against Eaton's 9PX datasheet for exact sizing.