The KNX-20E-640 with Wall Mount AC Adapters 19.2W, 30V, 640mA, 180-264VAC is a DC-DC power supply manufactured by Mean Well. This product features a high efficiency design and low acoustic noise. It is designed for DIN rail mounting with a wide range of input voltages from 180-264VAC. It offers an adjustable output voltage with an output current rating of 640mA. This power supply is ideal for KNX systems, light industrial applications, and residential automation systems.