... , 15-30KA selected Pole:1P,2P,3P,4P LV Grade C type withdrawable power surge arrester 1. Description: surge protection device ... , surge arrester) is suitable for TT, IT, TN-S, TN-C-S etc. power supply system of AC 50/60HZ, installed ... electric device separate from the power system and give indication signal. White means normal, red means abnormal, it also could be ...