Plug-in module for a rail-mounted device, and rail-mounted device

A rail-mounted device having a base part and at least one plug-in module,

• wherein the plug-in module is equipped:
• with a housing, which has a first axial end portion and a second axial end portion;
• wherein, between the first axial end portion and the second axial end portion, the housing has a plurality of essentially planar side surfaces;
• with a first resiliently elastic tongue, which is fitted on a first side surface of the housing;
• wherein the first resiliently elastic tongue has a first axial end portion, which is fitted on the housing, and a second axial end portion, which can be moved in a resiliently elastic manner;
• wherein a first latching nose is formed between the first and second axial end portions and protrudes from the first side surface of the housing;
• and with a first actuating element, which is mounted in a movable manner on the first side surface and can be moved from a first position, in which it is arranged essentially within the housing, into a second position, in which it is located to some extent outside the housing and is arranged in abutment against the second axial end portion;
• wherein in the second position, by virtue of a user applying an essentially lateral force to the first actuating element, the first latching nose can be moved into the housing;
• wherein the base part has a first aperture, which is formed on a first side and is intended for accommodating a carrying rail, and also has a second aperture, which is formed on a second side, arranged opposite the first side, and is intended for accommodating the at least one plug-in module;
• wherein the base part has a first undercut, into which the first latching nose has been inserted with locking action in the plugged-in state.