Universal rotary dimmer with central piece (R, L, C, LED), series 1930/glass, black/white. Universal rotary dimmer with central piece with extension input for push button (normally open) with single-surface operation, voltage test possible without removal, leading edge/trailing edge or LED leading edge phase control depending on the type of load (self-learning). With brightness memory, lamp-protecting soft start, incremental encoder, short-circuit proof and overload proof (electronic fuse), screw terminals. Note: Do not connect inductive and capacitive loads together.