... 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 ... voltage is too high, low voltage, phase, reverse phase (phase sequence), to voltage unbalance relay protection, products ... out an area of 1.0 ~ 2.5mm. If the single strand copper wire into the terminal directly ...