... <25ns. Can be replaced for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection ... device (in short: SPD, alias: surge suppressor, surge arrester) is suitable for ... means abnormal, it also could be replaced for the module when has operating voltage.Application ... PositionNS1-(D, C, B)5 surge protective device is applicable for D,C,B grade lightening-proof, ...