| 摘要 |
An electrical circuit breaker pole comprises an arc extinguishing chamber 24 with two side flanges 68, a rear wall 72, separators 78, a front opening 76, a lower arcing horn 34 electrically connected to the stationary contact means and an upper arcing horn 96. The rear part 84 of the lower arcing horn is of large width. It is bordered by a periphery 92 made of gas-generating material interposed between the edge of the rear part 84 and the side flanges 68. This arrangement fosters breaking of arcs of weak intensity , in high voltage.
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