A mounting and latching mechanism of an electrical device for fastening to a standard rail, to an immovable claw, and to a claw that is movable via a spring force, wherein the movable claw can be translationally moved relative to the immovable claw and wherein the immovable claw and the movable claw are formed as one piece having a connecting spring structure. A one-piece design is possible because of the translational mobility, which provides for cheap and simple production.