Carrier rail housing (1a, 1b, 1c) suitable for attachment to a carrier rail, in particular a top-hat rail, which has two holding legs (20, 21) that extend in the longitudinal direction and face outwards, said carrier rail housing (1a, 1b, 1c) comprising: - a carrier rail receiving opening into which the holding legs (20, 21) of the carrier rail are insertable, and - latching means which are configured to secure the holding legs (20, 21) in their desired mounting position inside the carrier rail receiving opening, wherein the carrier rail housing (1a, 1b, 1c) has at least one plug-in contact element which is arranged inside the carrier rail housing (1a, 1b, 1c) so as to face in the direction of the carrier rail receiving opening and comprises a number of plug-in contacts, and said carrier rail housing (1a, 1b, 1c) comprises at least one bus connector into which at least some of the plug-in contacts of the plug-in contact element are insertable, wherein the bus connector is electrically and mechanically connectable to a plug-in contact element of at least one additional carrier rail housing (1b, 1c) and wherein the latching means comprise two latching slides (4a, 4b) which are arranged to be displaceable on a mounting side of the carrier rail housing (1a, 1b, 1c) and can be latched to the carrier rail housing (1a, 1b, 1c) in a locking position, wherein each of the latching slides (4a, 4b) has a first end that has a holding section that extends in sections into the carrier rail receiving opening in the locking position, such that the bus connector is secured between the holding sections of the latching slides (4a, 4b) and the plug-in contact element inside the carrier rail receiving opening, characterised in that the bus connector comprises a base body with two mutually opposite ends, on each of which an inclined surface (51, 52) is formed, wherein the inclined surfaces (51, 52) are configured to move the latching slides (4a, 4b) outwards when the bus connector is inserted into the carrier rail receiving opening of the carrier rail housing (1a, 1b, 1c). - a carrier rail receiving opening into which the holding legs (20, 21) of the carrier rail are insertable, and - latching means which are configured to secure the holding legs (20, 21) in their desired mounting position inside the carrier rail receiving opening, wherein the carrier rail housing (1a, 1b, 1c) has at least one plug-in contact element which is arranged inside the carrier rail housing (1a, 1b, 1c) so as to face in the direction of the carrier rail receiving opening and comprises a number of plug-in contacts, and said carrier rail housing (1a, 1b, 1c) comprises at least one bus connector into which at least some of the plug-in contacts of the plug-in contact element are insertable, wherein the bus connector is electrically and mechanically connectable to a plug-in contact element of at least one additional carrier rail housing (1b, 1c) and wherein the latching means comprise two latching slides (4a, 4b) which are arranged to be displaceable on a mounting side of the carrier rail housing (1a, 1b, 1c) and can be latched to the carrier rail housing (1a, 1b, 1c) in a locking position, wherein each of the latching slides (4a, 4b) has a first end that has a holding section that extends in sections into the carrier rail receiving opening in the locking position, such that the bus connector is secured between the holding sections of the latching slides (4a, 4b) and the plug-in contact element inside the carrier rail receiving opening, characterised in that the bus connector comprises a base body with two mutually opposite ends, on each of which an inclined surface (51, 52) is formed, wherein the inclined surfaces (51, 52) are configured to move the latching slides (4a, 4b) outwards when the bus connector is inserted into the carrier rail receiving opening of the carrier rail housing (1a, 1b, 1c).