The MG73BH 230V is a 3 Phase 4-wire Voltage Relay, that will monitor your incoming 3-phase+N supply. The relay is fully featured with Under and Over voltage adjustment, Asymmetry and Delay Timers, and signal LED's for all fault conditions.
Protects against Phase Loss, Phase Reversal and Phase Asymmetry
Can be configured for 3 Phase, 4 wire or Phase 1 system
Selectable Under Voltage / Over Voltage Trip level