Abstract :
L. J. Linde and B. W. Wyman (General Electric Company, Philadelphia, Pa.): It has been of much interest to watch the development of the magnetic-type air circuit breaker and its applications to higher-capacity circuits. During the past six years this Institute has witnessed the gradual advancement of these breakers until we now have ratings from 50,000 to 500,000 kva at votage ratings of from 2,300 to 15,000 volts. Mr. Dickinson has presented an air circuit breaker designed to satisfy the very difficult problem of repetitive duty with high-current interrupting capacity. This breaker should be a welcome addition to the growing line of magnetic-type air circuit breakers.
