... special integrated circuit,and adopts SMT process. General:Type DTS557 Three-phase watt-hour meter applies Large-scale special integrated circuit,and ... industrial equipments.It has the features of strong andti-jamming,high overload.StandardIEC1036-1996Voltage circuit power consumption≤2W Operation voltage0.7Un ... /10A, 10/40A, 15/60A, 20/80A, 30/100A DTS557 three-phase electronic watt-hour meter