| 摘要 |
The invention concerns a fluid-immersed electric circuit breaker comprising first an second sets of fixed contacts each said set comprising a fixed main contact and a fixed arcing contact, an insulating carrier structure, a movable bridging contact carried on said insulating carrier structure and having first and second sets of movable contacts each set comprising a movable main contact and a movable arcing contact, said movable main and arcing contacts being movable to engage respective ones of said fixed main and arcing contacts, a fluid-filled arc-quenching chamber housing said movable contact sets and having a restricted outlet positioned so that under pressure of gas generated by arcing within the chamber a stream of said fluid under pressure is directed across an arcing path between one of said fixed arcing contacts and the associated one of said movable arcing contacts. In accordance with the invention the said arcing path is surrounded by at least one loop of ferromagnetic material which has been found to improve quenching of the arc.
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