Single-pole, coordinated lightning current arrester DEHNbloc Maxi S, type 1 according to EN 61643-11 on a spark gap basis with integrated arrester backup fuse for mounting on industrial busbar systems, high follow current extinguishing capacity and follow current limitation through RADAX Flow technology, 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