... module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in short: SPD, alias: surge suppressor, surge arrester) ... and Installation PositionNS1-(D, C, B)5 surge protective device is applicable for D,C,B grade lightening-proof, ... the electric network not shocked by thunder and lightening. These series usually installed in household distribution boards, computer equipment, frequency ...