... Maximum current of endure the lightning stroke 20kA (8/20aas). Time of response <25ns. Can be replaced for the module. Product DescriptionNS1-(D ... protection device (in short: SPD, alias: surge suppressor, surge arrester) is suitable for TN-S, TN-C-S, TT, IT etc. power ... normal, red means abnormal, it also could be replaced for the module when has operating voltage.Application Scope and Installation ...