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5530/5531 D-N three phase DIN rail watt-hour meter is a kind of new style three phase electronic watt-hour meter, the meter completely accord with relevant technical requirements of class 1 and class 2 single phase energy meter stipulated in National standard GB/T17215-2002 and international standard IEC61036. It can accurately and directly measure active energy consumption from three phase AC electricity and display total energy consumption by step type impulse register or LCD display.