Patent ID: 8100707

Claim:
A plug contact pairing comprising: a plug receptacle including contact pins in an interior of the plug receptacle; and a plug head with contact bushes for the connection of electrical lead ends, wherein a form-locked fastening of the plug contact pairing forms when the plug head and the plug receptacle are in the inserted state, wherein the form-locked fastening of the plug contact pairing comprises a profiled ring (fastening ring), wherein a portion of the fastening ring is placed into a circumferential fastening ring groove of the plug head and when the plug contact pairing is closed to form a fastening ring connection, a remaining portion of the fastening ring engages a fastening ring groove on an internal circumference of the plug receptacle, wherein the fastening ring connection including said fastening ring grooves and the fastening ring with regards to shape and material of the fastening ring as well as the shape of said fastening ring grooves is so constructed that the plug head can be pulled out from the plug receptacle only with a tensile force that exceeds a boundary value, and wherein the plug head inserted with one end into a congruent end of a plug housing is fastened in a form-locked manner by a second profiled ring (retaining ring), wherein a portion of the retaining ring is placed into a circumferential retaining ring groove on an external circumference of said one end of the plug head and wherein a remaining portion of the retaining ring engages a retaining ring groove on an internal circumference of the plug housing when the plug head and plug housing form a retaining ring connection, wherein the fastening ring connection, including said fastening ring grooves and the fastening ring with regards to shape, material and shape of said fastening ring grooves, when compared with the retaining ring connection, is so constructed that the tensile force, with which the plug head can be pulled out from the plug receptacle, is smaller than that holding the plug head in the plug housing by means of the retaining ring connection.