... 3. Benefits :High efficiencyLow thermal lossAdvanced IGBT module for easier maintenance and repairingLow noise generationSmall ... frequency50Hz±10%,60Hz±10%Input overtone current6pulses rectifier<30% 12pulses rectifier plus filter <5%Charge modeConstant current ... Production Range: UPS, three phase (10kva~800kva), single phase(300va~20kva), three phase in and single phase out(6kva~80kva), online ...