An improved low-voltage air circuit breaker

Abstract

ANEW 225- and 600-ampere frame size air circuit breaker incorporating the recent war improvements is now available. The principal advantages offered in this design over older ones specifically are 1. An improved arc chute of reduced size. 2. Long-lived contacts with momentary ratings equal to interrupting ratings. 3. Flexible and rugged overcurrent devices capable of necessary precision timing for selective tripping systems, but equally suitable for simple overload protection. 4. A 30 per cent reduction in size. 5. Longer life and lower maintenance from improved design.