This series of surge protectors is suitable for AC 50/60Hz and 380V or less, for supply systems such as TT, IT, TN-S, and TN-C-S. They can serve as equipotential bonding at interfaces in LPZ1, LP22, and LP23 zones. The design complies with IEC61643-1 and GB18802.1 standards. They can be mounted on 35mm electrical busbars. This product features an internal failure disconnection 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).