| 摘要 |
Disclosed is an air circuit breaker including a switching mechanism (2) formed of a plurality of links (29,34,35) so as to compress a closing spring (25) by converting a rotating operation of a rotational shaft (21) and to generate a driving force derived from an elastic restoring force of the ciosing spring (25); and a switching shaft (3) mechanically connected to the switching mechanism (2) so as to transfer the dnving force generated from the switching mechanism to a movable contact (38), wherein the switching shaft (3) is provided with a pair of holders (45) installed at both sides from a center of the switching shaft so as to rotatably support the switching shaft (3) at a frame (9) supporting the both sides of the switching mechanism. Accordingly, the operation deviation of the circuit can be minimized by preventing the switching shaft from being deformed when the circuit performs a switching operation, and the lifespan of the air circuit breaker can be increased by reducing abrasion of componerits.
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