Electrical connector comprising - a plug element with a longitudinal axis, said plug element having a plug housing with a circular cross-section and a coupling ring arrangement (6; 6a, 6b) mounted rotatably about the longitudinal axis, wherein at least one guide lug which projects radially inward is arranged on the inner circumferential face of the coupling ring arrangement (6; 6a), and - a socket element with a longitudinal axis, said socket element having a socket housing with a circular cross-section for accommodating the plug housing, wherein, on the outer circumferential face of the socket housing, at least one spiral-shaped guide groove for receiving the at least one guide lug of the coupling ring arrangement (6; 6a) is disposed, and wherein, at the end of the at least one guide groove, an end position for the at least one guide lug of the coupling ring arrangement (6; 6a) is disposed, characterized in that the coupling ring arrangement - has a first internal coupling ring - which is mounted to the plug housing such that it can be rotated about the longitudinal axis of the plug housing, but, in the direction of the longitudinal axis, is not movably mounted, and - has disposed on its internal circumferential face the at least one guide lug which projects radially inward, and - has a second external coupling ring, - which is mounted to the internal coupling ring rotationally fixed, but - which, in the direction of the longitudinal axis, can be moved along its longitudinal axis between - a release position, in which the coupling ring arrangement can be rotated relative to the plug housing about the longitudinal axis of the plug housing, and - a latching position, in which a rotation of the coupling ring arrangement relative to the plug housing is blocked, wherein the external coupling ring can be moved into the latching position at least when the at least one guide lug is in the end position, and wherein between the coupling rings (6a, 6b), a spring element is arranged which acts in such a way that it presses the external coupling ring into the latching position. - a plug element with a longitudinal axis, said plug element having a plug housing with a circular cross-section and a coupling ring arrangement (6; 6a, 6b) mounted rotatably about the longitudinal axis, wherein at least one guide lug which projects radially inward is arranged on the inner circumferential face of the coupling ring arrangement (6; 6a), and - a socket element with a longitudinal axis, said socket element having a socket housing with a circular cross-section for accommodating the plug housing, wherein, on the outer circumferential face of the socket housing, at least one spiral-shaped guide groove for receiving the at least one guide lug of the coupling ring arrangement (6; 6a) is disposed, and wherein, at the end of the at least one guide groove, an end position for the at least one guide lug of the coupling ring arrangement (6; 6a) is disposed, characterized in that the coupling ring arrangement - has a first internal coupling ring - which is mounted to the plug housing such that it can be rotated about the longitudinal axis of the plug housing, but, in the direction of the longitudinal axis, is not movably mounted, and - has disposed on its internal circumferential face the at least one guide lug which projects radially inward, and - which is mounted to the plug housing such that it can be rotated about the longitudinal axis of the plug housing, but, in the direction of the longitudinal axis, is not movably mounted, and - has disposed on its internal circumferential face the at least one guide lug which projects radially inward, and - has a second external coupling ring, - which is mounted to the internal coupling ring rotationally fixed, but - which, in the direction of the longitudinal axis, can be moved along its longitudinal axis between - a release position, in which the coupling ring arrangement can be rotated relative to the plug housing about the longitudinal axis of the plug housing, and - a latching position, in which a rotation of the coupling ring arrangement relative to the plug housing is blocked, - which is mounted to the internal coupling ring rotationally fixed, but - which, in the direction of the longitudinal axis, can be moved along its longitudinal axis between - a release position, in which the coupling ring arrangement can be rotated relative to the plug housing about the longitudinal axis of the plug housing, and - a latching position, in which a rotation of the coupling ring arrangement relative to the plug housing is blocked, wherein the external coupling ring can be moved into the latching position at least when the at least one guide lug is in the end position, and wherein between the coupling rings (6a, 6b), a spring element is arranged which acts in such a way that it presses the external coupling ring into the latching position.