Description Modular surge arrester for TT and TN-S systems Circuit variant “" 3+1"” The modular surge arresters DEHNGuard M... set new standards in functional red/line family design when it comes to safety and comfort. The proven protective circuit with powerful zinc oxide varistors combined with the dual-acting thermal dynamic control device is a trademark of DEHNGUARD technology. The focus is on both safe surge protection and device security in modular DEHNguard is demonstrated by a variety of device features. The application-oriented product name, which significantly simplifies the correct selection of devices, is just as an expression of the high safety requirements as the application of module locking unique to surge protection devices. This fixes the protection modules firmly in the device base. Neither shock caused by transport nor the enormous current forces during a