... voltage, frequency in one circuit, each phase current, power, power factor, energy in three circuits, with 3DI+1DO ... , frequency in one circuit, each phase current, power, power factor, energy in four circuits, with 3DI+1DO ... power consumption≤1VA Auxiliary power supply DC power supplyDC18~90V AC / DC power supplyAC85~265V/DC85~330V(optional) power consumption ≤5VA or ≤2W multi-channels power meter ...