Circuit breaker with welded contact interlock, gas sealing...

H - Electricity – 01 – H

Patent

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Details

H01H 3/32 (2006.01) H01H 3/04 (2006.01) H01H 9/02 (2006.01) H01H 9/16 (2006.01) H01H 71/50 (2006.01) H01H 71/74 (2006.01) H01H 77/10 (2006.01)

Patent

CA 2238734

A circuit breaker includes a housing, an operating mechanism and separable main contacts, and a rotatable crossbar which rotates to open and close the contacts. The crossbar interacts by way of a protrusion thereon with a rotatable, positive off-link. A handle mechanism is disposed in the housing and has a handle protruding from the housing which is normally movable from a closed to open disposition. However, if the operating mechanism has reacted in such a way as to open the separable main contacts but, in fact, they have not opened because, for example, they are welded shut, the protrusion on the crossbar will interact with the positive off-link and prevent the handle mechanism from moving to the opened position thus warning personnel that the contacts have not opened. There is also provided in association with the crossbar a cam which is spring loaded from the bottom against a portion of a cavity in a crossbar which interacts with a movable portion of the movable contact in such a manner as to latch it open when it has independently moved to an opened position relative to the rotatable crossbar. The cam rider reacts in such a way that it seals off or protects the aforementioned spring from gaseous arc products during the opening operation. There is provided on the trip mechanism a double pitch spring. The double pitch being such as to expand the range of the adjustment characteristic of the tripping mechanism.

Disjoncteur comportant un boîtier, un mécanisme de déclenchement, des contacts principaux séparables et une barre pivotant sur un axe pour ouvrir ou fermer les contacts. La barre porte un élément en saillie destiné à agir avec une biellette articulée de rappel de la manette à la position d'ouverture. Un mécanisme d'ouverture placé à l'intérieur du boîtier est relié à une manette à l'extérieur du boîtier qu'on peut normalement déplacer de la position de fermeture à la position d'ouverture. Cependant, si le mécanisme d'ouverture commande l'ouverture des contacts principaux séparables mais que ceux-ci ne s'ouvrent pas pour une raison quelconque, par exemple, parce qu'ils sont collés, l'élément en saillie de la barre agit avec la biellette pour empêcher le mécanisme d'ouverture de se déplacer en position d'ouverture, avertissant ainsi que les contacts ne sont pas ouverts. Une came qu'un ressort sous-jacent pousse dans une partie d'une cavité de la barre agit avec une partie mobile du contact mobile de manière à la verrouiller en position d'ouverture lorsque celle-ci s'est déplacée en position d'ouverture indépendamment de la barre. Le suiveur de came agit de manière à isoler ou protéger ledit ressort des gaz produits par l'arc lors de l'ouverture. Le mécanisme de déclenchement est muni d'un ressort à deux pas différents, permettant un réglage plus fin du mécanisme.

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