An electrical device includes: a first housing sub-assembly; a second housing sub-assembly that has a housing wall; and a locking device. The first housing sub-assembly and the second housing sub-assembly are positionable adjacent to one another along a plug-in direction and, when in a position in which they are adjacent to one another, are interlocked via the locking device. The locking device has an actuation element arranged on the second housing sub-assembly so as to be adjustable along an actuation direction, and a locking element connected adjustably to the housing wall and operatively connected to the actuation element. The locking element is configured, in the position of the housing sub-assemblies in which they are adjacent to one another, to interlock the first housing sub-assembly and the second housing sub-assembly, and, by moving the actuation element in the actuation direction towards the housing wall, are movable in an unblocking direction.