Longlife single phase watt-hour meter 1)Current spec.: DD450-2:2.5(5)A,5(10)A,10(20)A,15(30)A,20(40)A,30(60)A,40(80)A DD450-4:1.5(5)A,2.5(10)A,3(12)A,5(20)A,10(40)A,15(60)A,20(80)A DD450-6:5(30)A,10(60)A,15(90)A 2)Reference voltage:220V