KAC's New enhanced range of single pole key switch devices provides switching solutions for a broad range of applications. These include fire, security, smoke vent, extinguishant systems and many other specialist applications. The robust switching device comprises a main housing and escutcheon plate. Single pole key switch fitted to the plate which simply snaps into the main housing and is permanently located in place with fixing screws. All key switches are supplied with 2 sturdy keys.