... Can be replaced for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in short: ... , surge arrester) is suitable for TN-S, TN-C-S, TT, IT etc. power supply system of ... to IEC616431, GB18802.1, it adopts 35mm standard rail, there is a failure release mounted on the ... voltage.Application Scope and Installation PositionNS1-(D, C, B)5 surge protective device is applicable for ...