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Monitoring relay 22.5mm wide, 3 phase voltage monitoring, over and under voltages 1 to 150V AC or VDC, Two SPDT 3-phase voltage relay Monitors overvoltages and undervoltages for 3-phase 3-wire or 4-wire power supplies, in one unit. Switch setting for 3-phase 3-wire or 3-phase 4-wire power supply. Overvoltages or undervoltages: Operation time setting from 0.1 to 30 s Relay warning status can easily be monitored using the LED indicator Separate outputs possible for overvoltages and undervoltages Reset method: Automatic Power ON lock: 1 s or 5 s