DIN rail power supplies are units that are distinguished by a special housing, in the back of which there is a hook that allows for mounting on a 35 mm wide metal rail. Mounting involves pressing the power supply housing to the rail, which automatically attaches it using a latch without the need to use tools. Individual power units of this type have the same housing height and depth, and depending on the output power, they only differ in width. They have a screw connection in the lower and upper part of the housing, and the connection to the installation is made via a cable.