| 摘要 |
<p>A puffer type circuit interrupter in which fingershaped arcing contacts are provided with a large cooling effect by gas which is provided to blow out the arc at the time of an interruption operation. One of a pair of arcing contacts, which are connected to respective output terminals, is provided with a plurality of fingers designed to mate with the other of the arcing contacts. The fingers are attached to a puffer cylinder which has formed in it passageways for directing gas compressed within the cylinder onto the fingers. Inside the fingers is positioned a cylindrical gas guide which, together with a portion of the cylinder which may be a piston rod, directs the flow of air over the fingers in such a manner that the gas passes substantially completely over the fingers before reaching the arc. With this construction, the gas passing the fingers is not heated and hence the amount of metal vaporized from the fingers is quite small.</p> |
