Maximum current of endure the lightning stroke 20kA (8/20aas). Time of response <25ns. Can be ... surge protection device (in short: SPD, alias: surge suppressor, surge arrester) is suitable for TN-S, TN-C-S, TT, IT ... also could be replaced for the module when has operating voltage.Application Scope and Installation PositionNS1-(D, C, B)5 ... , 8 pieces.Model and Meaning NS1-(D, C, B)5 Lightning Arrester