Backward compatible contactless socket connector, and backward compatible contactless socket connector system

The invention relates to socket connectors and socket connector systems for electrically connecting a first corresponding plug connector and for capacitively connecting a second corresponding plug connector. Further, the invention relates to a plug connector for capacitively connecting a corresponding socket connector. In order to allow for an electrical connection or a capacitive connection, the invention suggest providing a connecting element, arranged within the housing of the socket connector, including contact portion for contacting a connection area of the first plug connector, and a non-contact portion arranged such that, in the mated state, the surface thereof covers at least parts of a connection area of the second plug connector.