An electrical connector comprising one or more housings and a carrier adapted to receive the housing(s). The housing comprises a flexible lance adapted to flex to maintain an electrical contact in the receptacle. The carrier comprises a protrusion. When the lance is in its unlock condition, the lance cooperates with the protrusion to prevent the housing from reaching the assembled position with respect to the carrier. When the lance is in its lock condition, the lance does not cooperate with the protrusion.