... . Can be replaced for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in short: SPD, alias: surge suppressor ... , it's designed according to IEC616431, GB18802.1, it adopts 35mm standard rail, there is a failure release mounted on the ... Scope and Installation PositionNS1-(D, C, B)5 surge protective device is applicable for D,C,B grade lightening-proof, installed on the ...