H - Electricity – 01 – H
Patent
H - Electricity
01
H
H01H 71/10 (2006.01) H01H 77/10 (2006.01)
Patent
CA 2214541
The movable contact arms of a circuit breaker are latched in the blow open position to prevent rebound and possible restrike of the arc in response to the very high magnetic repulsion forces generated by a short circuit in the protected electrical system. Each movable contact arm is mounted on a secondary carrier coupled to a main carrier by a spring loaded cam mechanism which allows the movable contact arm to blow open before the main carrier is rotated to the open position by the spring driven circuit breaker operating mechanism. In one embodiment of the invention, the movable contact arm is latched in the blow open position by a latching detent in the cam surface of the cam mechanism. In a preferred embodiment, the secondary carrier is latched by a detent formed by a leaf spring cantilevered from a fixed support. Subsequent rotation of the main carrier by the operating mechanism releases the latch by rotating the secondary carrier clear of the detent formed by the leaf spring.
Les contacts mobiles d'un coupe-circuit sont verrouillés en position ouverte afin d'empêcher le rebond et la formation d'un nouvel arc en réponse aux très grandes forces de répulsion magnétique produites par un court-circuit dans le système électrique protégé. Chaque contact mobile est monté sur un support secondaire couplé à un support principal au moyen d'un mécanisme à came à ressort qui permet au contact mobile de s'ouvrir avant que le support principal ne pivote en position ouverte sous l'effet du mécanisme de commande à ressort du coupe-circuit. Dans une version de l'invention, le contact mobile est verrouillé en position ouverte par un cran d'arrêt à la surface de la came. Dans une version préférée, le support secondaire est verrouillé par un cran formé d'un ressort à lame en porte-à-faux par rapport à un support fixe. La rotation subséquente du support principal sous l'effet du mécanisme de commande libère le verrou en faisant tourner le support secondaire à l'écart du cran formé d'un ressort à lame.
Beck Henry Richard
Fischer Kenneth Martin
White Richard Edwin III
Bereskin & Parr
Corporation Eaton
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