Function and features: Type DDSI306 single phase electronic carrier-wave watt-hour meter( one tariff/ multi tariffs), is a new generation product for measuring energy with the function of charging in period- of- time and storage and transportation reading meter. It is at a leading position in precision of measuring energy and storage and transportation communication. This kind of product is designed and manufactured according to the IEC international standard and China national standard. Its integrated performance is high and its cost is low. Error: Comply with IEC62053-21-2003 Reference frequency: 50 Hz Measuring range: 00000.00?9999.99 kWh Carrier-wave communication: Extended frequency 15 digits, center frequency 120k, bandwidth 15 kHz Power loss: <0. 5W at static state, <3 W at carrier-wave emission MTBF: ≤ 5*10 4 hours Source voltage: 220V Reference current: 5(30)A Current capacity of relay: > 40A Output parameter of power pulse: Pulse width 80ms, 5-24 V DC