NOVELTY - The contact (1) has a plug pin (15) mounted at a receiving chamber (3) or between an area between the receiving chamber and a passage channel (5) that is pushed by a supporting bush in an insertion direction. An electric conductor lies in the receiving chamber and connected to an optical waveguide in a final assembly state. The passage channel is pushed up to a free end of the plug pin or an end of the supporting bush. The electric conductor is designed as a copper strand that comprises an insulation part and a cover. The contact is designed rotationally symmetrical to the passage channel.    USE - Plug or socket contact for use as a switch-off device of photovoltaic cells and photovoltaic cell modules, in case of fire, during monitoring of photovoltaic cells and photovoltaic cell modules, and as a control circuit in an electrical plug connector of an optoelectronic apparatus (all claimed). Can also be used as a safety switch for an automatic controlled door.    ADVANTAGE - The electric conductor lies in the receiving chamber and connected to the optical waveguide in the final assembly state, and the passage channel is pushed up to the free end of the plug pin or the end of the supporting bush, so that two physical independent line systems are integrated, thus ensuring compact structure in the contact while simplifying construction of the contact. The electric conductor is designed as the copper strand that comprises the insulation part and the cover, thus protecting the conductor against mechanical damage. The plug or socket contact is rotated against each other in the final assembly state without affecting stability and form-fitting of the connection, thus reducing labor intensity for assembling the contact while avoiding mechanical twisting of the electric conductor.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a plug contact.    Plug or socket contact (1)    Middle longitudinal axis (2)    Receiving chamber (3)    Passage channel (5)    Plug pin (15)