... Can be replaced for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in short ... surge suppressor, surge arrester) is suitable for TN-S, TN-C-S, TT, IT etc. power supply system of ... joint of LPZ1 or LPZ2 and LPZ3, it's designed according to IEC616431, GB18802.1, it ... and Installation PositionNS1-(D, C, B)5 surge protective device is applicable for D,C,B grade lightening-proof ...