... Phase Loss protection 2,Phase sequence protection 3,Phase unbalance protection JVRDphase sequence voltage protection device(Voltage and Phase Relay)Features:1,Phase Loss protection2,Phase ... rated voltage 460V below, industrial three-phase 220V, 380V, 440V, 460V and so the ... phase, reverse phase (phase sequence), to voltage unbalance relay protection, products are widely used in air compressor, electric ...