Subrack and module assembly comprising the subrack

A module assembly comprising:

• a subrack;
• a frame defining a subrack space and adapted to receive a device module to an operative position in which the device module is located in the subrack space, the frame comprising four side walls and an end wall;
• a subrack connector system adapted to be in electrically conducting connection with a device module connector system of the device module while the device module is in the operative position, the subrack connector system comprising a plurality of subrack connectors fastened to the end wall such that the plurality of subrack connectors is accessible from the subrack space,
• wherein the subrack comprises a coupling system adapted for coupling the subrack to four other subracks in order to form a subrack matrix, the coupling system comprising at least one wall recess on an inner surface of each of the side walls, and at least one primary screw hole in each of the side walls such that the at least one primary screw hole is located in the at least one wall recess wherein each of the wall recesses is adapted to accommodate screw heads of at least one screw mounted to the at least one primary screw hole located in the wall recess, and extending outwards from the wall recess through the at least one primary screw hole such that the subrack space is adapted to receive the device module to the operative position while there is a corresponding screw mounted in each of the at least one primary screw hole;
• and
• a device module including at least one electrical device, and a device module connector system,
• wherein the device module is adapted to be connected in a connecting event to an operative position relative to the subrack such that in the operative position the device module connector system is electrically conductively connected to the subrack connector system.