The LOP-400-12 from Mean Well USA is chassis mount AC/DC open frame power supply (PSU) with 1 Output: 12 V, 20.8 A. This power supply has 80 to 264 VAC or 113 to 370 VDC input voltage range, 250 W power, 4 kV isolation voltage and 94% efficiency. Dimensions of this PSU are: 5.00" L x 3.00" W x 1.08" H (127.0mm x 76.2mm x 27.5mm). Operating temperature range is from -40°C to 80°C (with derating).