Abstract: An electrical plug-in connection has a plug part with contact pins and a socket part with socket contacts. Coding elements interact in accordance with the lock/key principle in order for the two parts to be fixed in place in a pre-defined relative plug-in position. One or more protrusions, and apertures complementing the protrusions, are provided on the plug or socket parts. On being connected, one protrusion each is incorporated in an aperture, engaging behind the periphery of the associated aperture in the process. The aperture has two adjacent accommodating chambers. A plug-in accommodating-chamber periphery that is directed away from the plug-in direction, is at such a low level that the associated protrusion slides over it in the plug-in direction, and an arresting accommodating-chamber periphery is at such a high level to effectively prevent sliding of the protrusion over the arresting accommodating-chamber periphery.

Abstract: An electrical plug-in connection has a plug part with contact pins and a socket part with socket contacts. Coding elements interact in accordance with the lock/key principle in order for the two parts to be fixed in place in a pre-defined relative plug-in position. One or more protrusions, and apertures complementing the protrusions, are provided on the plug or socket parts. On being connected, one protrusion each is incorporated in an aperture, engaging behind the periphery of the associated aperture in the process. The aperture has two adjacent accommodating chambers. A plug-in accommodating-chamber periphery that is directed away from the plug-in direction, is at such a low level that the associated protrusion slides over it in the plug-in direction, and an arresting accommodating-chamber periphery is at such a high level to effectively prevent sliding of the protrusion over the arresting accommodating-chamber periphery.

Abstract: An electrical plug-in connector is in the form of a cable plug connector or a device connector plug. A particularly reliable and tightly-sealed connector may be achieved, whereby the plug-in connector is disclosed, and contains a connector mechanism, which is self-closing on bringing the parts for connection together. The plug-in connector further contains a radial seal for sealing the parts connected together.