1) DDSY 5558 Single phase electronicPre-paid Watt hour Meter 2)power metering 3)load ... contro 4)customer information The DDSy5558 type single-phase electronic pre-paid watt-hour meter isdeveloped on the bass ... of excellent single-phase electronic watt-hour meter.it is a new type of ... ),5(30),10(40),10(60),15(600) DDSY5558 Single phase energy meter