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 , the said at least one electrical terminal 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 , 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 , the said at least one electrical terminal 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 , 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. <EOS>