The Three Phase Over/Undervoltage, Phase Sequence-Phase Failure Relay is designed for measuring the three-phase mains with neutral monitoring. It operates at a voltage range of 3x400V/230V. The relay has a maximum voltage range of 242-288V + 5% and a minimum voltage range of 173-219V + 5%. It has a time delay of 0.5-10 seconds and features one changeover contact with an 8 A rating from the measured voltage. The relay is compact, with a width of only 17.5 mm per module.