The surge protective device (SPD) is mainly used for the overvoltage protection (lightning protection) of single-phase AC (220V AC) transmission lines and equipment in low-voltage power grids, and meets the lightning protection test requirements of Class II of IEC61643-11. - Large discharge current and fast response time - 1+NPE mode, modular structure consisting of basic module and plug-in module - The protection module achieves double tripping of overheating and overcurrent, which is safe and reliable.