The APC Easy UPS 3S is a three-phase UPS, here rated 30kVA at 400V in a "3:1" configuration — meaning three-phase input converted to single-phase output, a common setup for facilities with three-phase mains feeding single-phase IT/critical loads. This listing is for the UPS unit without internal batteries included, so a battery pack (internal or external) must be sourced separately before it can provide backup runtime; it carries a 1-year warranty. Equipment at this power rating is aimed at server rooms, small data centres, or critical commercial/industrial loads, not general office or consumer use.