An electrical contactor a casing formed of an electrically insulating material and at least one connection terminal mounted in the casing configured to establish and maintain a contact between an electrical conductor inserted in the connection terminal and an electrical link bar mounted in the casing to ensure an electrical connection between the electrical link bar and the electrical conductor. The connection terminal having a contact spring configured so that the contact between the electrical conductor and the electrical link bar results from a force insertion of the electrical conductor in opposition to the action of the contact spring and is automatically maintained by the contact spring after insertion of the electrical conductor. The casing has a peripheral wall and a cover configured to be assembled together along a mounting direction substantially parallel to the direction in which the electrical conductor is inserted in the connection terminal.