... under-voltage, output over or under-voltage, over-temperature, reverse connection, phase failure, and short circuit protection. The ... insulation status (need Insulation Status Detector ), detecting the switch status (need Switch Status Detector ) (5) Battery discharging managment (need ... keep the same 110V or 220V DC.Small size, light weightNatural cooling with heat sink, low failure rateCE, RoHS ...