The HDR20-5-12 is a 230 V AC power supply for DIN rail control cabinets. The output voltage can be selected via switch: 5 V at max. 4 A, 9 V at max. 2.22 A or 12 V at max. 1.67 A. Exceptionally high reliability is achieved thanks to the capacitor-free technology (without electrolytic capacitors). An active surge protector automatically discharges the output under overvoltage conditions. The device is insensitive to typical faults such as input transients, short circuit at the output, no-load operation and moderate voltage surges at the input and output. A green power LED indicates stable operation. Operation is possible in an ambient temperature range from -40°C to +50°C. Derating may be required. Features