surge protector device Product DescriptionCAN-D20 series surge protection device (in short: SPD, alias: surge suppressor, surge ... , TN-C-S, TT, IT etc. power supply system of AC 50/60Hz, <440V, installed on the joint of LPZ1 or ... 's suitable for D grade (class) lightning protection, CAN-D20 series surge protection device according to IEC61643-1, GB18802.1, installed ...