Starter contactor comprising: - a cover; - a contact rod which is mobile relative to the cover, between a position of rest and an active position; - a retention collar which is integral in translation with the contact rod; - a contact plate made of electrically conductive material fitted on the contact rod, the contact plate being mobile relative to the contact rod, between an initial position in which the contact rod is in the position of rest, and a final position in which the contact rod is in the active position, the contact plate being in contact with the retention collar in the initial position, and a gap being formed between the retention collar and the contact plate in the final position; - at least one electrical terminal (21, 23), the said at least one electrical terminal (21, 23) being in contact with the contact plate in its final position; - a compression spring which is designed to be fitted around and on the contact rod on a first side of the contact plate, with the compression spring developing a force for compression of the contact plate on the at least one terminal in the final position; - a return spring which is designed to be fitted on the contact rod on a second side of the contact plate, opposite the first side of the contact plate, with the return spring developing a return force on the contact rod, from the active position to the position of rest, thus making it possible to disconnect the contact plate from the at least one electrical terminal (21, 23), characterised in that the force of the compression spring on the contact plate in the final position is at least 20 N more than the force of the return spring on the contact rod in the active position. - a cover; - a contact rod which is mobile relative to the cover, between a position of rest and an active position; - a retention collar which is integral in translation with the contact rod; - a contact plate made of electrically conductive material fitted on the contact rod, the contact plate being mobile relative to the contact rod, between an initial position in which the contact rod is in the position of rest, and a final position in which the contact rod is in the active position, the contact plate being in contact with the retention collar in the initial position, and a gap being formed between the retention collar and the contact plate in the final position; - at least one electrical terminal (21, 23), the said at least one electrical terminal (21, 23) being in contact with the contact plate in its final position; - a compression spring which is designed to be fitted around and on the contact rod on a first side of the contact plate, with the compression spring developing a force for compression of the contact plate on the at least one terminal in the final position; - a return spring which is designed to be fitted on the contact rod on a second side of the contact plate, opposite the first side of the contact plate, with the return spring developing a return force on the contact rod, from the active position to the position of rest, thus making it possible to disconnect the contact plate from the at least one electrical terminal (21, 23), characterised in that the force of the compression spring on the contact plate in the final position is at least 20 N more than the force of the return spring on the contact rod in the active position.