The invention relates to a connection system for establishing a detachable electrically conductive connection, including a female connector and a male connector compatible therewith. The female connector includes a socket with annular concentric contact openings and contact elements arranged within the contact openings. The male connector includes a plug with contact elements which can be inserted into the contact openings of the socket. Ferromagnetic elements are arranged concentrically around the socket or the plug, the ferromagnetic elements of the male connector and of the female connector having mutual attraction in order to generate a retaining force between the two connectors.

A female terminal is provided with a tube portion and a spring piece to be arranged inside the tube portion. The tube portion has an opening end, through which a male terminal is inserted, and a first inner surface and a second inner surface facing each other across the spring piece. The spring piece is cantilevered and supported on the first inner surface. The spring piece has a front side region configured to face the male terminal, a back side region to be arranged on the side of the first inner surface and at least one protrusion provided in the back side region. The protrusion locally projects toward the first inner surface.

A female terminal is provided with a tube portion and a spring piece to be arranged inside the tube portion. The tube portion has an opening end, through which a male terminal is inserted, and a first inner surface and a second inner surface facing each other across the spring piece. The spring piece is cantilevered and supported on the first inner surface. The spring piece has a front side region configured to face the male terminal, a back side region to be arranged on the side of the first inner surface and at least one protrusion provided in the back side region. The protrusion locally projects toward the first inner surface.

A circular power connector that can accommodate plugs of varying diameters includes a plurality of electrical terminals that include a contact beam extending from and monolithic with base, where the contact beam includes a contact portion, and a mounting portion that extends from and monolithic with a base for mounting the terminal to a substrate. The terminals are cylindrically arranged to receive a plug. Alternatively, each electrical terminal includes a frame portion, a first contact beam extending from the frame in a first direction, and a second contact beam extending from the frame in a second direction. Multiple electrical terminals are oriented so that the first and second contact beams for one terminal extend at an angle, preferably perpendicular, to the first and second contact beams of another electrical terminal, in a still further embodiment, an electrical terminal having two halves is provided.

An elastic contact element of the electrical connector is provided and has an upper ring, a lower ring, and a plurality of elastic flat bodies connected to and located between the upper ring and the lower ring. Each one of the elastic flat bodies is strip-shaped and forms a contact portion. The elastic flat bodies are spaced apart from each other and divided into several groups according to different height positions of the contact portions. Each one of the contact portions protrudes toward a center axis. Because the elastic flat bodies are divided into several groups according to different height positions of the contact portions, the elastic flat bodies contact an inserted male probe at various positions.

An electrical connection structure includes: a first unit including a terminal; and a second unit including a connection terminal. The electrical connection structure is configured by mounting the second unit to the first unit such that the connection terminal is electrically connected to the terminal. The terminal has a plate-shaped tab. The connection terminal includes a receptacle formed with a connection groove into which the tab is inserted, and a spring contact provided on inner side surfaces of the connection groove. The spring contact comes into elastic contact with outer surfaces of the tab inserted into the connection groove.

A socket includes a housing and a plurality of contacts. The housing is formed in a box-shape with an opening and is provided with a matrix of through holes at a bottom portion. The plurality of contacts includes ground contacts and signal contacts which are arranged so as to be aligned alternately in a predetermined array direction by one or a plurality of them and are passed through the through holes. The ground contacts adjacent to each other in the array direction are short-circuited.

A socket includes a housing and a plurality of contacts. The housing is formed in a box-shape with an opening and is provided with a matrix of through holes at a bottom portion. The plurality of contacts includes ground contacts and signal contacts which are arranged so as to be aligned alternately in a predetermined array direction by one or a plurality of them and are passed through the through holes. The ground contacts adjacent to each other in the array direction are short-circuited.

The invention relates to a socket contact element for establishing an electrically conductive connection including a crimp section for establishing an electrically conductive connection to a line and a contact box for establishing a detachable electrically conductive connection to a contact box plug, wherein the socket contact element is constructed in one piece and includes a plurality of integrally implemented functions based on geometrical designs. Furthermore, the invention relates to a sheet-shaped semifinished product for producing a socket contact element and the production method by forming.

The invention relates to a socket contact element for establishing an electrically conductive connection including a crimp section for establishing an electrically conductive connection to a line and a contact box for establishing a detachable electrically conductive connection to a contact box plug, wherein the socket contact element is constructed in one piece and includes a plurality of integrally implemented functions based on geometrical designs. Furthermore, the invention relates to a sheet-shaped semifinished product for producing a socket contact element and the production method by forming.