ANT1-D series surge protective device(in short; SPD, alias; surge protector,surge arrecter)is suitable for TN-S,TN-C-S,TT,I Tect.Power supply system of AC 50/60 HZ,=380V,installed on joint of LAP1 or LPZ2 and LPZ3,it’s design according to IEC61643-1,GB18802.1 , it’s adopts 35mm standard rail,there is a failure release mounted on the module of suge protective device. When the SPD fails in breakerdown for over-heat and over-current,the failure erelease will help electric device separate from the power system and give the indication signal, green means abnormal, it’s also could be replaced for the module when has operating voltage.