A connector assembly is composed of a housing component (20) having connection contacts (40) accessible via an opeing (2l). An operating member (30) locates with the component (20) and has a plate-like body (33) engaging in the opening (2l) thereof. The body (33) presents an array of cams (35) which compress the contacts (40) when the member (30) is displaced to urge the body (33) within the opening (2l) to an initial extent. A further opening (3l) in the operating member (30) receives a group of conductors (5l) which can be inserted fully and freely into channels (36) in the body (33) beneath cantilevered portions (4l) of the contacts (40) compressed by the cams (35). The cams (35) are dimensioned to release the contact portions (4l) which then grip the conductors (5l) when the member (30) is further dispalced to insert the body (33) further within the opening (2l).