The KBMC/MS Series are panel mount, fan speed controls which provide infinitely variable speed control of shaded pole, PSC, and AC/DC motors. These solid state AC variable voltage fan controls operate from 115/230VAC, 50/60 Hz and are designed to replace obsolete tapped windings, chokes, rheostats, and other methods, which are currently being used to obtain speed variations. The controls come standard with an internal power on/off line switch. The controls come with a self-threading Bushing and nut for panel mounting.