Patent ID: 7518477

Claim:
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 ( 8 ) traversed by a magnetising current for producing a magnetic field ( 26 ) adapted to drive an arc 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 ( 12 ) electrically connected to the magnetising coil ( 8 ) and adapted to cooperate with said arc in such a manner that the latter generates said magnetising current in the magnetising coil ( 8 ), the magnetic field for driving the arc being generated by the action of said arc, characterized by the fact that said electrode means ( 12 ) are located in such a relationship with said contact elements ( 5 , 6 ) that the arc generated by the separation of said two contact elements is at least partially separated into a first arc ( 13 a ) between one contact element ( 5 ) and the electrode means ( 12 ) and a second arc ( 13 b ) between the electrode means ( 12 ) and the other contact element ( 6 ), said first or second arc ( 13 a, 13 b ) being set in parallel coupling with said magnetising coil ( 8 ) connected on one side to the electrode means ( 12 ) and on the other side to one of the contact elements ( 5 , 6 ).