... be replaced for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in short: SPD, ... Scope and Installation PositionNS1-(D, C, B)5 surge protective device is applicable for D, ... C,B grade lightening-proof, installed on the joint ... and order, you should indicate the product series, model and quantity in detail. For example: 5NS1-40 ...