DS904 type three phases, three lines meritorious electric energy meter is the abroad advanced technology, to design and development of a new generation of three-phase watt-hour meter long life technology, used for measuring and frequency than for 50 Hz a

DS904 type three phases, three lines meritorious electric energy meter is the abroad advanced technology, to design and development of a new generation of three-phase watt-hour meter long life technology, used for measuring and frequency than for 50 Hz ac ac active