Module connector and contact protection element

A connector comprising:

• a first connection element, wherein the first connection element has a socket with an axially extending shaft and the shaft has a through opening with a radially extending collar, wherein a first screw element and a contact protection element are arranged on the first connection element, wherein the contact protection element is arranged on the side of the socket facing the collar of the socket, wherein the contact protection element has a dome and the first screw element is guided axially movable in the dome, wherein the first screw element has a radially extending head and axially extending bolt, the head bearing against at least elements of an inner lateral surface of the dome, and the inner lateral surface is profiled along a longitudinal section, parallel to the longitudinal axis of the fastening element, of the dome, in the axial direction such that the opening cross-section of the dome varies;
• a second connection element, wherein the second connection element has a socket with an axially extending cup-shaped shaft and a radially extending collar, and wherein the second connection element has a second screw element extending axially into the cup-shaped shaft, wherein the opening of the cup-shaped shaft widens in an axial direction away from the collar and the screw element is at least partially insulated from the collar;
• wherein the shaft of the first connection element engages the shaft of the second connection element, and the first screw element is engaged with the second screw element through the through opening of the shaft of the first connection element, and in an unthreaded state the head is retained in the holding region, in a transitional state between the unthreaded state and a fully threaded state, the head is in the transitional region, and in the fully threaded state, the head is in the spreading region and spreads the dome radially outward.