... 5 series surge protection device (in short: SPD, alias: surge suppressor, surge arrester) is suitable for TN-S, ... standard rail, there is a failure release mounted on the module of surge protection device. \When the ... PositionNS1-(D, C, B)5 surge protective device is applicable for D,C,B grade lightening-proof, ... the socket box in control equipment. It is also applied for below 6floor household and small ...