... four-wire 3x220/380V or 3x57.7/100V Three-phase Three-wire 3x100V or 3x380V 3, Rated Frequency(Hz ... overload, low power consumption, light weight etc 2,Measure three phase active electric energy, Do not need calibrate for ... (60),3x30(80),3x30(100)Rated Voltage(V) Three-phase four-wire 3×220/380V or 3×57 ... Hz): 50/60Hz Accuracy class 1 or 2 Three phase three wire electronic digital multi tariff kWh Meter,