... -function power meter with following features:1) To measure: Voltage, Current, Active Power, Reactive Power, Power Factor, Frequency ... 4) Isolation between Input and Output signal;5) True effective value measuring;6) Two alarm output for Voltage, Current, ... times Instantaneous: 2 times/10SConsumption of voltage <1VA (each phase)Voltage imdepance ≥ 300K Ω Voltage accuracy RMS measure, accuracy class 0 ...