... <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 TN-S, TN-C-S, TT, IT etc. power supply system of AC 50 ... series usually installed in household distribution boards, computer equipment, frequency conversion equipment, operating room, custody, electronic equipment etc. and in ...