... <25ns. Can be replaced for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in short: SPD, alias: surge ... .Application Scope and Installation PositionNS1-(D, C, B)5 surge protective device is applicable for D,C,B grade lightening-proof, installed on ... -40/4-385, 8 pieces.Model and Meaning NS1-(D, C, B)5 Lightning Arrester