Abstract: In a casing for accommodating electronic components mounted on a printed circuit board, a lower box has a substantially U-shaped cross section, and includes a floor and at least two side walls. Each of the side walls has a horizontal slot proximate an upper edge thereof. At least one of the side walls has a resilient snap nose formed therein which is biased inwardly in the casing. A lid is also provided for closing the lower box, and the lid may have a closing edge thereon formed as a cross-sectionally double obtuse-angled stop tongue. A bead may be provided on a lower portion of the snap nose to orient a pc board in the casing.

Abstract: A special arrangement of a module with serial coupling possibility is described. The module is characterized by at least one angular attachment projecting vertically from the front or visible surface and which as a result of its arrangement and shaping serves as a gripping strip, cable guide and fastening aid. The fastening of the module within a casing frame is provided by a clip fastening (20) with two clearly defined swivel positions. Advantageously there are two angular attachments on the front of the module, which engage in spaced manner over the area of the connection sockets for the plugs along one longitudinal edge of the front side.