... , surge arrester) is suitable for TN-S, TN-C-S, TT, IT etc. power supply system of AC 50/60Hz, <440V, installed ... on the joint of LPZ1 or LPZ2 and LPZ3, it's designed according to ... mounted on the module of surge protection device. When the SPD fails in breakdown for over-heat and over-current, the failure ...