... . Can be replaced for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in short: SPD, alias: surge ... has operating voltage.Application Scope and Installation PositionNS1-(D, C, B)5 surge protective device is applicable for D,C ... ,B grade lightening-proof, installed on the joint of LPZOA zone or LPZOB and LPZ1 zone, which protects the electric network ...