Minilec Voltage Monitoring Relays S1 UVR5 Overview Suitable for 3 Ph. 4 W System Fixed Under Voltage Adjustable Power ON / Reset Delay Auto Reset, 1 CO Output Relay Technical Specification System Supply System 400 VAC ± 20% ( 3 ø - 4 W), 48 - 63 Hz. Auxillary Built In Output Contact Output Contact 1