| 摘要 |
An arc chamber channel for providing cooling of an electric arc and quenching thereof for use with a circuit breaker includes an integral, generally U-shaped member which forms a base and opposing side walls. One end of the opposing side walls has extending tabs which are folded outwardly, providing a pair of point contacts for engaging side walls of a circuit breaker housing. An opposite end of the base is formed with an extending tab for engaging a molded feature of a side wall of the circuit breaker housing. Thus, all the extending tabs are adapted to space the channel away from the side walls of the circuit breaker, thereby exposing outer surfaces of the channel when in use in a circuit breaker. The base has an arrangement of venting holes therein. The tabs can be diagonally folded outwardly, and the channel can be formed of steel. An improved circuit breaker housing can include the channel, the housing further including a vent passage within the housing which is exterior to the channel. Molded projections in the housing are formed in a vent passage in proximity to the holes to provide cooling surfaces. The projections are spaced away from the holes sufficiently to provide passage of expulsive gases.
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