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SPECIFICATION:Used for AC single phase active energy measuring. DIN rail installation type, compact design. Display type: mechanical counter, unit is kwh, record active total energy.Display range of the counter: 5+1,6+1 Accuracy active energy measuring, no need degugging for long time work STANDARDS:According to IEC62053-11 standardAccording to IEC62053-21 standardFUNCTIONS:Total energy= positive active+negative active Display data after power off (counter display)TECHNICAL SPEC.:Reference voltage (Un):110V, 120V, 220V, 230V, 240VNormal work voltage: 80%~120%UnLimit work voltage: 70%~130%UnCur