... :1P,2P,3P,4P suitable for 35MM din rail LV Grade B type withdrawable power lightning surge arrester 1. Description: surge protection ... protector, surge arrester) is suitable for TT, IT, TN-S, TN-C-S etc. power supply system of AC 50/60HZ, installed ... device separate from the power system and give indication signal. White means normal, red means abnormal, it also could be replaced ...