DD283, DD284 single phase watt-hour meter is induction meter which is applicable to measure the rated frequency 50HZ~60HZ and power loss in electrified wire netting. All technical targets are completely conformed to National standard GB/T 15283-94 and International Standard IEC521. There are three kinds of covers,aluminum,plastic and glass. 1)Rated current:2(6),3(9),5(15),10(30),15(45),20(60)A 2)Rated voltage:110/220V