Combined arrester type 1 + type 2 + type 3 according to EN 61643-11 for TT and TN-S systems (3+1 circuit). Subsequent integration of a single-pole B6 circuit breaker possible to implement a power supply for the intelligent measuring system. Two sockets for the 230 V power supply (N and L) each for RfZ / APZ according to VDE-AR-N 4100 are integrated in the device, for use on the 40 mm busbar system in the main power supply system according to DIN VDE 0100-443 in buildings without an external lightning protection system (also with overhead line feed).