Single-pole, coordinated DEHNbloc modular lightning current arrester, type 1 according to EN 61643-11 on a spark gap basis, consisting of a base part and a plugged-in protection module. Maximum system availability thanks to RADAX-Flow follow current limitation. For protecting low-voltage consumer systems against overvoltages, even in the event of direct lightning strikes. For use in the lightning protection zone concept at the interfaces 0A - 1.