Electrical connector and connector assembly having inner and outer plug housings

1. An electrical connector, comprising:

an inner plug housing having a front end portion that is received in a hood of a receptacle connector, the hood having at least one engaging member extending therefrom;

an outer plug housing at least partially surrounding the hood, the outer plug housing being displaceable relative to the inner plug housing in a direction of insertion and removal of the inner plug housing from the hood;

at least one engaging arm extending in a space between the outer plug housing and the inner plug housing that engages the engaging member on the hood;

the outer plug housing having an engagement release portion opposing the engaging arm that interferes with the engaging arm to disengage the engaging arm from the engaging member when the outer plug housing is moved in the direction of removal of the inner plug housing from the hood; and

a displacement stop member disposed on the inner plug housing that is displaceable between a stop position and a stop release position, the stop position preventing the outer plug housing from moving in the direction of removal of the inner plug housing from the hood and the stop release position releasing the stopping of the outer plug housing from the moving in the direction of removal of the inner plug housing from the hood.

2. The electrical connector of claim 1 , wherein the displacement stop member abuts the outer plug housing in the stop position and is separated from the outer plug housing in the stop release position.

3. The electrical connector of claim 1 , wherein the engaging member extends from an external wall of the hood.

4. The electrical connector of claim 1 , wherein the outer plug housing substantially surrounds the inner plug housing.

5. The electrical connector of claim 1 , wherein the displacement stop member is an annular lock ring, the displacement stop member being rotatable about the inner plug housing between the stop position and the stop release position.

6. The electrical connector of claim 5 , wherein the displacement stop member includes at least two semi-circular segments.

7. The electrical connector of claim 5 , wherein the outer plug housing includes cam pins and the displacement stop member includes a cam surface corresponding to the cam pins, the cam pins and the cam surface interacting to displace the displacement stop member between the stop position and the stop release position.

8. The electrical connector of claim 1 , wherein the displacement stop member is a U-shaped member displaceable between the stop release position and the stop position.

9. The electrical connector of claim 5 , wherein the displacement stop member extends perpendicular to the direction of insertion and removal of the inner plug housing from the hood in the stop release position and in the stop position.

10. The electrical connector of claim 5 , wherein the displacement stop member is rotatable about a hinge.

11. The electrical connector of claim 10 , wherein the displacement stop member extends perpendicular to the direction of insertion and removal of the inner plug housing from the hood in the stop release position and parallel to the direction of insertion and removal of the inner plug housing from the hood in the stop position.