... /20aas). Time of response <25ns. Can be replaced for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in ... : SPD, alias: surge suppressor, surge arrester) is suitable for TN-S, TN-C-S, TT, IT etc. power supply system of AC ... .Application Scope and Installation PositionNS1-(D, C, B)5 surge protective device is applicable for D,C,B grade lightening-proof, installed on ...