Wall switch ST4-150 II, 4-stage rotary switch for ceiling fans. The ST4-150 II is a 4-stage rotary switch designed for noise-free control of ceiling fans. The controller operates with micro capacitors and has an IP44 protection rating. It comes with a surface-mounted housing, and installation in standard flush-mounted boxes is possible. A special feature of the ST4-150 II is its ability to integrate into any switch system with a 6 mm shaft using the knob, frame, and central cover plate from the external system. For ceiling fans with lights, a separate dimmer or switch is used. Maximum motor power is 150 watts.