The sliding sleeve 22 is mounted on the housing 20 so as to be movable in relation to the contact carrier 21 and to the housing 20 (along the plug-in axis S). A plurality of (in the present case, two) elastic elements 23, here in the form of spiral springs, is arranged between the contact carrier 21 and the sliding sleeve 22. In the sectional view of FIG. 2, one of the elastic elements 23 is visible; the other is arranged symmetrically thereto. The elastic elements 23 are respectively supported on the sliding sleeve 22 and on the contact carrier 21. In the present case, for each elastic element 23, a support point 212 is provided on the contact carrier 21 and a support point 223 is provided on the sliding sleeve 22. The respective elastic element 23 is securely held at the support points 212, 223. A displacement of the sliding sleeve 22 in relation to the contact carrier 21 tensions the elastic elements 23 in a spring-elastic manner.