1.high frequency,online double conversion,IGBT 2.N+X redundant,Hot-swap,green UPS 3 ... top modular UPS manufactures in China. They are widely used in different fields, including electric power, science institute, ... SOLUTION220V,230V,240V; 50Hz,60Hz; 3/3, 3/1, 1/3, 1/1GREAT PERFORMANCE INDEXOverall efficiency ≥ 95%, inverter efficiency ≥97 ... easy, just with the power module changed. UPS for computer