The invention relates to an accessory intended to be assembled to a connector along an assembly axis, comprising: a main body (20), at least one deformable contact element (60) comprising a contact part (70) intended to exert, after assembling the accessory (10) to the connector (90), pressure on an electrically conducting surface of said connector and a part intended to be in contact, after assembling the accessory to said connector, with said main body, said contact element being able to ensure electrical connection between said parts, characterized in that it furthermore comprises pressure means able to push said contact part in such a way as to increase said pressure.