... and Phase Relay)Features:1,Phase Loss protection2,Phase sequence protection3,Under voltage protection4,Over voltage protection5 Model and ... protection, phase unbalance= ×100%> 10%, protection delay 2S action.4) Over voltage protection: it means the protection circuit voltage higher ... action to restore back to the difference of 3 ~ 20VAC.4 Main technical data1) Main circuit: 1. Rated voltage: 220VAC, ...