DIN Rail Power Supplies TDK-Lambda 10W to 960W DIN Rail Power Supplies are designed for rugged industrial applications. These power supplies include TDK-Lambda DRB and DRF series that deliver between 15W to 960W output power with a choice of standard output voltages from single-phase AC input. Efficiency up to 94% minimizes energy consumption. These units are convection-cooled and can be operated at up +70°C. The narrow width saves valuable space on the DIN rail.