... <25ns. Can be replaced for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in ... C-S, TT, IT etc. power supply system of AC 50/60Hz, <380V, installed on the joint of LPZ1 ... 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 ...