Universal dimmer switch with rotary knob, MOSFET power up to 800W. Automatic lamp detection. Standby loss of only 0.2 watts. Adjustable minimum and maximum brightness. Modular device for DIN-EN 60715 TH35 rail mounting. 2 division units = 36mm wide, 58mm deep. Universal dimmer switch for lamps up to 800W, depending on ventilation conditions, dimmable energy-saving lamps (ESL) and dimmable 230V LED lamps also depending on the lamp electronics. Up to 3600W with power supplements at connections X1 and X2. Zero-cross switching with soft start and soft stop to protect the lamps. Universal control voltage 8-230V UC, galvanically isolated from the supply and switching voltage of 230V. No minimum load required. PWM control with 10-24V DC at the PWM and GND terminals. The set brightness value is saved when switched off. In case of a power failure, the switching position and brightness value are saved and restored.