DTM904 type three-phase four-wire pulse watt-hour meter is mechanical and electrical one-piece watt-hour meter, DT904 type by three-phase four-wire type meritorious electric energy meter and three-phase intelligent device component, used for measuring pu

DTM904 type three-phase four-wire pulse watt-hour meter is mechanical and electrical one-piece watt-hour meter, DT904 type by three-phase four-wire type meritorious electric energy meter and three-phase intelligent device component, used for measuring pulse than for 50 Hz ac frequency and