A connection device is provided including a housing with a chimney for inserting wires to be connected, extended inside the housing, and in which a catch is locked. A plug, having a slotted clip for gripping, pulling and stripping the wires by extrusion of their sheath between the catch and the clip, is driven into the housing. The clip is locked on the housing. The space between the clip and the catch is less than the diameter of the core of the wires.