Power supply for supplying a DALI system for up to 64 participants or 100 DALI loads (max. 200mA). The power supply is short-circuit proof and voltage-proof against 230/240V external voltage. The operating status, possible short circuits and activities on the DALI control line are signaled via an LED. The mains voltage is connected on the input side and the DALI control line is connected on the output side. The connections are made via screw terminals. Switch cabinet device made of flame-retardant polycarbonate, halogen-free. Installation takes place in switch and distribution cabinets on 35mm top hat rails in accordance with EN 50022 at a permissible ambient temperature of 0...50°C. Protection class IP20, dimensions: 35 x 90 x 59mm.