Multi-pole surge protection DEHNguard MP ACI, Type 2 according to EN 61643-11 with integrated ACI switch/lightning protection combination, consisting of a base unit with pluggable protection modules and a double-pluggable terminal block suitable for stub and through-wiring. High device safety is ensured by surge monitoring with thermo-dynamic control. This device is designed to protect low-voltage consumer installations against surges and is suitable for use in lightning protection zone concepts at interfaces 0B 1 and higher.