Four-pole surge arrester DEHNrail modular, type 3 according to EN 61643-11, consisting of a base element and a plugged-in protection module. High discharge capacity due to powerful zinc oxide varistor/spark gap combination. For protecting the mains supply of industrial electronic devices against transient overvoltages in control cabinets. For use in the lightning protection zone concept at interfaces 1 - 2 and higher.