Abstract: An electrical connector assembly includes a main housing with a guide receiving and guiding a slider, the slider having an oblique groove and a cam surface, a cover mountable to the main housing, and a lever hinged to the cover and having a cam counter surface. In a pre-lock condition, the cam counter surface is coupled with the cam surface to translate the slider upon tilting of the lever. The oblique groove cooperates with a mating element of a socket to move the electrical connector assembly into engagement with the socket upon translation of the slider. The cover is mountable to the main housing in a first and a reverse second orientation. The lever and the main housing have a poka yoke device establishing the pre-lock condition only when the lever is tilted into a predetermined initial position.