Patent ID: 8013268

Claim:
A circuit breaker for high or medium voltages, comprising at least the following: a drive bar movable in translation along an axis (A-A′); a drive member coupled to the drive bar to move the drive bar in translation along the axis (A-A′); a circuit-breaking chamber comprising: a first contact comprising a main contact, an arcing contact, and a blast nozzle for extinguishing an electric arc, all fixed together, the first contact movable in translation along the axis (A-A′); a second contact disposed facing the first contact and comprising a main contact and an arcing contact that are fixed to each other, the second contact movable in translation along the axis (A-A′); and transmission means for separating the first contact and second contact from each other during a circuit-breaking operation, and a column insulator in communication with the circuit breaking chamber, the drive bar extending through the interior of the column insulator; wherein the drive bar is coupled to the second contact by coupling means to move the second contact in translation along the axis (A-A′) in the same direction as the drive bar, and wherein the transmission means are disposed on the side of the said chamber that is adjacent to the drive bar and are adapted to transmit the motion of the driven second contact to the first contact.