A releasable multiple-contact plug connector comprising: a socket side with an insulating socket housing and with a plurality of socket elements that are received in the socket housing, said socket elements having a socket section and a contact section for the purpose of providing an electrically conductive connection to an external element, in particular to a multi-wire cable, and a plug side with an insulating plug housing and with a plurality of plug elements that are received in the plug housing, said plug elements having a pin section and a contact section for the purpose of providing an electrically conductive connection to an external element, in particular a multi-wire cable, wherein the socket housing can be plugged together with the plug housing along a plugging-together direction, and wherein in the plugged-together state, the pin sections of the plug elements protrude into the socket sections of the socket elements so that an electrical contact arrangement can be provided between the socket side and the plug side by way of the socket section and the pin section, wherein the socket housing and the plug housing comprise a contact surface (11, 31), by way of which the socket housing and the plug housing are in contact with one another, wherein a wall extends from the contact surface of the plug housing or of the socket housing, which wall encompasses at least in part the pin sections or the socket sections or rather extends between the pin sections or the socket sections, wherein an opening extends into the socket housing and the plug housing respectively from the contact surface that does not comprise the wall, and the socket sections and the pin sections respectively lie in said opening, wherein the cross section of the wall in the direction perpendicular to the plugging-together direction matches the cross section of the opening in the direction perpendicular to the plugging-together direction and in the plugged-together state, the wall protrudes into the opening, wherein the wall comprises a multiplicity of grooves that extend in the direction parallel to the pin sections or the socket sections respectively, wherein the grooves provide a depression and a ridge that extends from the depression, wherein the grooves encompass at least in part parts of the socket element or the plug element, characterized in that the grooves are embodied in a rounded concave manner and encompass in each case parts of the plug elements or of the socket elements respectively in a manner that is semi-circular in shape when viewed in the cross section, wherein in each case a socket element or a plug element respectively is arranged per groove. a socket side with an insulating socket housing and with a plurality of socket elements that are received in the socket housing, said socket elements having a socket section and a contact section for the purpose of providing an electrically conductive connection to an external element, in particular to a multi-wire cable, and a plug side with an insulating plug housing and with a plurality of plug elements that are received in the plug housing, said plug elements having a pin section and a contact section for the purpose of providing an electrically conductive connection to an external element, in particular a multi-wire cable, wherein the socket housing can be plugged together with the plug housing along a plugging-together direction, and wherein in the plugged-together state, the pin sections of the plug elements protrude into the socket sections of the socket elements so that an electrical contact arrangement can be provided between the socket side and the plug side by way of the socket section and the pin section, wherein the socket housing and the plug housing comprise a contact surface (11, 31), by way of which the socket housing and the plug housing are in contact with one another, wherein a wall extends from the contact surface of the plug housing or of the socket housing, which wall encompasses at least in part the pin sections or the socket sections or rather extends between the pin sections or the socket sections, wherein an opening extends into the socket housing and the plug housing respectively from the contact surface that does not comprise the wall, and the socket sections and the pin sections respectively lie in said opening, wherein the cross section of the wall in the direction perpendicular to the plugging-together direction matches the cross section of the opening in the direction perpendicular to the plugging-together direction and in the plugged-together state, the wall protrudes into the opening, wherein the wall comprises a multiplicity of grooves that extend in the direction parallel to the pin sections or the socket sections respectively, wherein the grooves provide a depression and a ridge that extends from the depression, wherein the grooves encompass at least in part parts of the socket element or the plug element, characterized in that the grooves are embodied in a rounded concave manner and encompass in each case parts of the plug elements or of the socket elements respectively in a manner that is semi-circular in shape when viewed in the cross section, wherein in each case a socket element or a plug element respectively is arranged per groove.