... ), 20(80), 30(100) 4)ISO, CCC DDSY1777 series single phase prepayment watt-hour meterRated voltage:220VUltimate loadvoltage:65%-190% rated ... , 5(20), 10(40), 15(60), 20(80), 30(100)Power consumption:<0.6WPrecision:2.0Rated freqency:50/60HzStartup Current:≤0 ... Constant:6400,3200,1600,800imp/kwhData Storage:≥ 10 years after power downWorking life:> 10 years