A plug connector has a housing with a cap, the cap having a lever which can adopt a first position and a second position. In this case, the housing is opened in the first position of the lever and closed in the second position of the lever. Furthermore, the plug connector has a locking device which can adopt a blocking position which is intended to lock the lever in the second position. The locking device is elastically movable out of its blocking position into a release position in order to unlock the lever in the second position. Furthermore, the locking device is elastically movable out of its blocking position into an overload position in order to unlock the lever in the second position if a force exerted on the lever exceeds a set value. In this case, the overload position differs from the release position.