... Introduction.The three-phase AC induction mechanical watt-hour meter is used to measure the active ... )AccuracyConnection Three-Phase Four-line Active Power Mechanical Watt-hour MeterDT8623*220/3801.5(6), 3(6 ... 0Direct Three-Phase Three-line Active Power Mechanical Watt-hour MeterDS8623*3801.5(6), 3(6) ... )2.0Mutual inductionThree-Phase Four-line Reactive Mechanical Watt-hour MeterDX8623*3801.5(6), 3(6)3 ...