Discover our new fire brigade safety switch for PV systems with overvoltage protection! Here we equipped an industrial building with a 1 MW roof-mounted system (128 strings) with generator disconnection and surge protection. The QFire BIG switch boxes also contain a T2 surge arrester. A T1+T2 combination arrester would also be possible here. Each of these BIG switch boxes switches up to 16 PV strings. Modularly expandable, retrofittable and easy to install!