Universal dimmer switch, power MOSFET up to 800W. Automatic lamp detection. Standby loss only 0.3 watts. Minimum brightness and dimming speed adjustable. Includes children's room, snooze, and light alarm functions. Additionally features light scene control and constant light regulation. Rail-mounted device for installation on a mounting rail. 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 lamp electronics. Up to 3600W with power supplements FLUD14 at terminals X1 and X2. Switching in zero crossing with soft on and soft off for lamp protection. Switching voltage 230V. No minimum load required. The set brightness level is saved when switched off (memory). In the event of a power failure, the switching position and brightness level are saved and can be activated upon restoration of the supply voltage. Automatic electronic overload protection and overtemperature shutdown. Connection to the Eltako RS485 bus. Cross-wiring bus and power supply with jumper. The upper rotary switch LA/LRN is initially needed for learning and determines during operation whether automatic lamp detection should be active or specific comfort settings. The LED accompanies the learning process according to the operating instructions and indicates control commands during operation by briefly flashing.