Circuit breaker with arc chamber vents.

摘要

The invention relates to a molded-case circuit breaker with arc chamber vents formed in a housing end wall, and with line terminal members extending into the flow paths of arc gases issuing from the respective vents.
<??>For each line terminal member (92), the front cover (14) of the circuit breaker housing is provided with a tubular portion (86) which extends telescopically over the associated terminal member to shield it from contact with arc gases being vented. Preferably, the distal end of the tubular portion (86) is bevelled (102) to provide a syphoning effect causing ambient air to be drawn (arrow 100) through the tubular portion and admixed with the arc gas.