This series of surge protectors is suitable for AC 50/60Hz and 380V or less, and can be used in power supply systems such as TT, IT, TN-S, and TN-C-S. It can serve as an equipotential bonding at interfaces in LPZ1, LP22, and LP23 zones. The design conforms to IEC61643-1 and GB18802.1 standards. It can be mounted on 35mm electrical busbars. The product features an internal failure disconnect device, which automatically disconnects the surge protector from the power grid in case of overcurrent, overheating, or breakdown failure. Simultaneously, the visible alarm indicator module changes from green (normal) to red (fault).