... , IEC III rank 4.Customizable,OEM&ODM Introduction1.Specification 3-phase Measure voltage current, active power, reactive power, power factor ... ,frequency and etc 3 One Form C Relay output 6 photo-coupler isolated digit ... : Voltage, current, active power, reactive Power of each phase, 3 Phase Power, 3 Phase reactive Power, Power Factor, Frequency and etc.. Voltage 0 ...