The Three Phase Over/Undervoltage, Phase Sequence-Phase Failure Relay is designed to measure the voltage of three-phase mains (3x400V). It has an upper level range of Umax 420-500V and a bottom level range of Umax 300-380V. The relay has a time delay of 0.5-10 seconds and features 1 changeover contact with an 8 A rating from the measured voltage. It is compact with a width of 17.5 mm, making it suitable for installation in tight spaces.