Multipole surge arrester DEHNguard MP ACI, type 2 according to EN 61643-11 with integrated ACI switch/spark gap combination, consisting of a base part with plugged-in protection modules and double push-in connection terminal suitable for branch and through-wiring. High device safety due to arrester monitoring with thermo-dynamic control. For protecting low-voltage consumer systems against surges. For use in the lightning protection zone concept at the interfaces 0B - 1 and higher.