Lever type electrical connector

A lever type electrical connector assembly includes a first connector having a first housing mounting a plurality of first terminals. A mating assist lever is pivotally movably mounted on the first connector for movement in a pivotal operating stroke between a pre-mated position at one end of the stroke and a fully mated position at an opposite end of the stroke. A second connector includes a second housing mateable with the first housing of the first connector. A coupling is provided between the mating assist lever and the second connector, whereby the connectors are mated and unmated in response to pivotal movement of the lever between its pre-mated and mated positions. Interengaging interference surfaces are provided at spaced locations between the first and second housings of the first and second connectors, respectively. The interference surfaces are engageable when the mating assist lever is at an intermediate point between the opposite ends of its operating stroke. Thereby, the housings are overstrained during an end portion of the operating stroke as the lever reaches its fully mated position.