... -D20 series surge protection device (in short: SPD, alias: surge suppressor, surge arrester) is suitable for TN-S, TN-C-S ... voltageProduct Features1.Could be replaced for the module not need power off.2.Maximum current of endure the lightning stroke 20kA (8 ... suitable for D grade (class) lightning protection, CAN-D20 series surge protection device according to IEC61643-1, GB18802.1, installed ...