Measuring 3-phase current, voltage, active power, reactive power, kwh, harmonic, extreme value etc. With RS485 interface. AccuracyEnergy measuring: active energy class 0.5 ... ~75°C; Relative humidity < 93%SafetyInsulationSignal, power supply, output terminal resistant to case > 100MΩDielectric strengthInput power supply > 2kV, input and output > 1kV ...