3 phase sequence voltage protection device 1,Phase Loss protection 2,Phase sequence protection 3,Phase unbalance protection JVRDphase sequence voltage protection device(Voltage and Phase ... , 440VAC, 460VAC. 2. The main circuit cable: insulated copper wire, which set out an area of 1.0 ~ 2.5mm ... use of a soft line, you must add a wire needle lugs to ensure reliable connection.2) The auxiliary circuit ...