Electromagnetic contactor with a double contact and starter for a heat engine having the same

The switch (10) has an electrically controllable microactuator i.e. micro-solenoid (MS), for authorizing or prohibiting the switching between closed contact operating states according to the electric control i.e. current, applied to the microactuator. The switching is prohibited by the microactuator using the force opposing the thrust of a movable contact wafer (CM) when the microactuator is electrically excited. An assembly with an electric coil (BO) and a movable magnetic core (NM) is arranged between grip jaws of a copper contact-spring clip (ET) of the microactuator.