Electrotechnical article

An electrical receptacle module for carrying electrical components adapted to be mounted into an opening of predetermined dimensions in a panel defined in a wall of an electrical apparatus, comprising in combination:

• a rigid module casing defining two mounting grooves of predetermined depth located on opposite sides of the module at a distance from each other corresponding to fit within the predetermined dimensions of the opening with groove bottoms substantially abutting panel edges defining the opening and further defining rigid groove walls for abutting opposite sides of the panel about the opening;
• said groove walls further defining a first groove wall surface for contacting one wall side of the panel, said groove wall surface being provided with mounting structure adapted to pass through the opening to register the grooves upon the panel edge about the opening on said one side of the panel;
• a second groove wall adapted to abut an opposite wall side of the panel without passing through the opening for retaining the module in place in the opening in a stable mounted state with the first groove walls abutting the panel;
• and "one of said groove bottoms that substantially abuts the panel edge being an elastically yielding structure that yields enough to allow movement of the module", a distance corresponding to the groove depth, thereby permitting the first groove wall to pass through the opening when the module is moved laterally toward a panel edge to seat the module in said opening in a stable mounted state with the grooves abutting the edges of the opening thus to retain the module in place in said panel opening.