Circuit breaker arrangement for protection against...

H - Electricity – 01 – H

Patent

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Details

H01H 9/46 (2006.01) H01H 9/30 (2006.01) H01H 33/76 (2006.01) H01H 9/34 (2006.01)

Patent

CA 2197878

An arrangement in an electrical switching device for protection against electrical arcs comprises a tripping mechanism, a stationary contact carrier, a movable contact carrier, an exhaust vent, an arc runner, and an arc extinguishing barrier. The stationary contact carrier has a stationary contact mounted thereon, and the movable contact carrier has a movable contact mounted thereon. In response to an overcurrent condition, the tripping mechanism causes the movable contact carrier to rotate from a closed position to an open position, thereby generating an electrical arc. In the closed position the movable contact abuts the stationary contact, and in the open position the movable contact is separated from the stationary contact. The arc extinguishing barrier is composed of an outgassing material and is located between the stationary contact and a portion of the tripping mechanism. The stationary contact is located generally between the portion of the tripping mechanism and the arc runner such that the arc runner draws the electrical arc away from the portion of the tripping mechanism. The exhaust vent is located generally in line with the initial direction of movement of the movable contact when the movable contact carrier begins rotating from the closed position to the open position.

Un agencement d'un dispositif de commutation électrique utilisé dans la protection contre les arcs électriques comprend un mécanisme déclencheur, un support de contact fixe, un support de contact mobile, un orifice d'évacuation, un conducteur d'arc et une barrière d'extinction d'arc. Sur le support de contact fixe est monté un contact fixe et sur le support de contact mobile est monté un contact mobile. En réponse à un état de courant de surcharge, le mécanisme de déclenchement fait tourner le support du contact mobile, qui passe d'une position fermée à une position ouverte, ce qui génère un arc électrique. En position fermée, le contact mobile rejoint le contact fixe, et en position ouverte, le contact mobile est séparé du contact fixe. La barrière d'extinction d'arc est composée d'un matériau de dégazage et est située entre le contact fixe et une partie du mécanisme de déclenchement. Le contact fixe est placé généralement entre la partie du mécanisme de déclenchement et le conducteur d'arc de sorte que celui-ci écarte l'arc électrique de la partie du mécanisme de déclenchement. L'orifice d'évacuation est généralement placé dans le prolongement du sens initial de déplacement du contact mobile lorsque le support du contact mobile commence à tourner et à se déplacer d'une position fermée à une position ouverte.

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