Surge arrester DPRO 230-Protector, type 3 according to EN 61643-11, with monitoring device and disconnection device. Increased safety due to Y-protection circuit that prevents confusion. Adapter devices for protecting the mains supply of electronic devices against transient overvoltages and high-frequency interference voltages (DEHNpro 230 F-Protector). For use in the lightning protection zone concept at interfaces 1 - 2 and higher.