Abstract: A circuit breaker assembly is equipped with a pre-tripping device comprising a fixed cam securedly united to a connecting base, which cooperates with a rocker and a transmission lever when the circuit breaker is drawn-in and drawn-out from the connecting base. The profile of the fixed cam is chosen to actuate the transmission lever and impose tripping of the circuit breaker, during draw-in or draw-out travel, whereas the transmission lever is in the inactive position after the circuit breaker is drawn-in or drawn-out, in which the latter can be opened or closed normally.

Abstract: A high-current multipole circuit breaker is made up of standard poles juxtaposed in a molded case. At least two adjacent poles are twinned, that is to say electrically arranged in parallel and connected to a common connecting strip. The connecting strips of the other poles are widened, so as to partially overlap the immediately adjacent twinned pole. In this way, the circuit breaker rating is higher than that of the individual poles which make it up.

Abstract: The circuit breaker is formed by two adjoined standard multipole molded cases, resin being cold-cast between the opposite side walls, comprising reliefs, of the two cases in order to provide fixing. A spacer, secured by bolts to the side walls of the two cases, defines their distance apart and can be used to cooperate with a racking cam when the circuit breaker is drawn into a fixed frame. The circuit breaker comprises an electronic trip device, an operating mechanism and an operating bar of the poles common to all the poles. At least two adjacent poles are twinned, that is to say eletrically connected in parallel.

Abstract: A sub-assembly comprising a contact finger support cage and a connection pad of each pole is securedly united to an intermediate insulating partition of the case by a bracket and screw fixing device. The cage is pivotally mounted on a spindle positioned in bearings of the pad, and is connected to a switching bar by a mechanical link cooperating with a disengageable coupling, capable of breaking the linking system with the bar at the level of each pole. One side wall of the insulating case includes an opening communicating with the compartment housing the separable contacts of each pole. The arc chute is fixedly secured to an insulating support capable of being moved in translation in the longitudinal direction of the pole to ensure either blanking-off of the opening in the inserted position of the arc chute inside the compartment, or removal of the arc chute via said opening allowing the condition of the contacts of each pole to be checked visually, without removing the main fixing screws of the case.

Abstract: A four-pole circuit breaker has an operating mechanism associated with one of the intermediate main poles, so as to take up an asymmetrical position with respect to the layout of the four poles. The mechanism has springs similar to those of a three-pole breaker. The transverse tie bar is common to the three main poles and is mechanically coupled to a kinetic linkage controlling the fourth pole, so as to bring about the closure of the contacts of the fourth pole before the closure of the contacts of the main poles upon closing of the breaker, in order to match the four-pole load torque to the three-pole motor torque of the mechanism.