Circuit breaker with improved trip mechanism

Details Circuit breaker with improved trip mechanism Circuit breaker with improved trip mechanism

H - Electricity

01

H

H01H 71/10 (2006.01) H01H 71/52 (2006.01) H01H 77/10 (2006.01) H01H 71/50 (2006.01)

Patent

CA 2225009

A circuit breaker mechanism has a contact arm (56) forming a portion of an interruptable load current path through the circuit breaker and mounted with respect to a pivot (110) for swinging motion to break the current path. A spring-loaded, over-center operating mechanism includes a toggle mechanism having an upper toggle (74) and a lower toggle (122) coupled by a spring pin (128) to form a toggle joint about which the toggles can relatively pivot. The spring pin has a circular groove (128b) at which it operatively connects to the toggle joint, and a circular surface (128a) adjacent the groove is disposed in the path of travel of the contact arm as the contact arm swings to break the current path. A V-shaped notch (56a, 56b) in the contact arm, acts between the toggle joint and the contact arm to locate the toggle joint radially of the contact arm pivot and thereby cause the toggle joint to be displaced by the swinging contact arm along an arc such that a principal component of the contact arm force is directed in a sense that fully, or at least approximately, maximizes the effect of the swinging contact arm force on the toggle mechanism.

Cette invention concerne un mécanisme déclencheur de disjoncteur qui comporte un bras de contact (56) qui forme une partie de la trajectoire d'un courant de charge interruptible traversant le disjoncteur et qui est monté par rapport à un pivot (110) autour duquel il doit basculer pour couper le courant. Un mécanisme basculeur à ressort comprend un organe mobile supérieur (74) et un organe mobile inférieur (122) couplés par une goupille à ressort (128) pour constituer une genouillère formant pivot de basculement. La goupille à ressort comporte une gorge circulaire (128b) de raccordement à la genouillère et une surface circulaire (128a) contiguë à ladite gorge et se trouvant sur la trajectoire du bras de contact basculant pour couper le courant. Une encoche en V (56a, 56b) pratiquée dans le bras de contact agit entre la genouillère et le bras de contact pour situer la genouillère radialement par rapport au pivot du bras de contact et faire en sorte que la genouillère soit déplacée par le basculement de ce bras selon un arc tel que la composante principale de la force de basculement du bras de contact agisse pleinement sur le mécanisme basculeur ou, à tout le moins maximise son effet sur celui-ci.

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