System, comprising an electronics housing for an electromechanical switching device and a grounding contact arrangement, wherein the electronics housing is configured so as to be placeable on a mounting rail and further comprises - at least one printed circuit board duct for inserting printed circuit boards, - connection terminals or plug-in connectors to connect electrical conductors, wherein the connection terminals are electrically connectable to at least one printed circuit board, - wherein an installation duct is provided in the bottom region of the electronics housing facing the mounting rail, the installation duct being accessible from outside the narrow side of the electronics housing, and being formed inside the electronics housing and parallel to the at least one printed circuit board duct, wherein the installation duct is formed near to an edge of the longitudinal side of the bottom region of the electronics housing, and is enclosed by housing faces of the electronics housing, and the grounding contact arrangement is configured to come to rest on the mounting rail in a resilient manner, characterised in that the grounding contact arrangement further comprises - a contact part formed as a blade contact, - a contact terminal which can be fastened on the contact part provided with a latching pin, - and a contact housing formed of insulating material and configured to receive the latching pin and the contact terminal, and - the grounding contact arrangement can be inserted into the installation duct irrespective of a position of the electronics housing on the mounting rail, and - the blade contact of the contact part is configured to come to rest on the mounting rail in a resilient manner. - at least one printed circuit board duct for inserting printed circuit boards, - connection terminals or plug-in connectors to connect electrical conductors, wherein the connection terminals are electrically connectable to at least one printed circuit board, - wherein an installation duct is provided in the bottom region of the electronics housing facing the mounting rail, the installation duct being accessible from outside the narrow side of the electronics housing, and being formed inside the electronics housing and parallel to the at least one printed circuit board duct, wherein the installation duct is formed near to an edge of the longitudinal side of the bottom region of the electronics housing, and is enclosed by housing faces of the electronics housing, and the grounding contact arrangement is configured to come to rest on the mounting rail in a resilient manner, characterised in that the grounding contact arrangement further comprises - a contact part formed as a blade contact, - a contact terminal which can be fastened on the contact part provided with a latching pin, - and a contact housing formed of insulating material and configured to receive the latching pin and the contact terminal, and - the grounding contact arrangement can be inserted into the installation duct irrespective of a position of the electronics housing on the mounting rail, and - the blade contact of the contact part is configured to come to rest on the mounting rail in a resilient manner.