Electromechanical circuit breaker

Electromechanical circuit breaker intended to establish and break the current in a main circuit (3, 4) and comprising a fixed contact element (5) and a moving contact element (6) which in a first position are in electrical contact with each other for carrying the current of the main circuit (3, 4), said moving contact element (6) being adapted to be displaced to a second position in which it is separated from the fixed contact element (5) so that the current in the main circuit is cut off, the circuit breaker being provided with a blow-out device (2) comprising a magnetising coil (11) traversed by a magnetising current for producing a magnetic field (B) adapted to drive an arc (17) generated by the separation of said two contact elements (5, 6) into an arc extinction means (1), the blow-out device (2) comprising electrode means (9, 10) electrically connected to the magnetising coil (11) and adapted to cooperate with said arc (17) in such a manner that the latter generates said magnetising current in the magnetising coil (11), the magnetic field (B) for driving the arc (17) being generated by the action of said arc (17), characterised by the fact that the blow-out device (2) further comprises magnetic means (15, 16) for producing a magnetic field (B15, B16) radially directed with respect to the arc (17) and adapted to generate a force (F15, F16) on the arc (17) in order to displace the latter so that the arc (17) is forced to contact the electrode means (9, 10).