... class product. HT-HM series UPS be widely applied to the telecommunication, bank, stock exchange centre, transportation, electricity, ... phase separately control, realizes the control of instantaneous over-loading balance, so as to reach 100% unbalanced load ... input frequency50Hz±10%,60Hz±10%ChargeCharge modeconstant current to constant voltage, with temp compensationBatteryBattery Typemaintenance-free ...