The superiority of the EM301 3Phase kWh meter lies in its ability to work normally under reverse current, unbalance voltage and current, reversed phase sequence and voltage variation. Features: Class 1 accuracy LEDs indicating presence of each phase Withstands 440V between phase and neutral Maintains accuracy under current reversal conditions High surge withstand capability up to 8kV Polycarbonate enclosure Anti-tamper features Dimensions: 172 H X 180.5 B X 76 D mm (For 5-20 A and 10-40 A models) 327 H X 187 B X 104 D mm (For 5-10 A, 10-60 A and 50-100 A models)