... isolation, Anti-Vibration.Performance CharacteristicsHigh-precision measure three-phase voltage,three-phase current,active power,reactive power ,apparent ... ±0.02Hz Signal InputMode of connectionsingle-phase ,three-phase three-wire,three-phase four-wireRated voltageAC57.7V ,AC 100V ... wiring diagram 96*96 THREE-PHASE THREE ROW AC VOLTAGE AND FREQUENCY LED DIGITAL COMBINATION METER RH-3UIF33