... DescriptionCAN-D20 series surge protection device (in short: SPD, alias: surge suppressor, surge arrester) is suitable for TN-S, TN-C-S ... a failure release mounted on the module of surge protection device. When the SPD fails in breakdown for over-heat ... PositionIt's suitable for D grade (class) lightning protection, CAN-D20 series surge protection device according to IEC61643-1, GB18802.1, installed ...