15.019 Electric Circuits, Science Service Historical Image Collection

1930 - C.R. Keith making adjustments on giant circuit breaker, capable of safely interrupting 138,000 volts

GIANT CIRCUIT BREAKER GETS FINAL TEST

CD 2487100 E&MP15.019

Electric Circuits, Breakers

1930

A giant circuit breaker, capable of safely interrupting 138,000 volts, get a final tune-up at the East Pittsburgh Works of the Westinghouse Electric Corporation.

C.R. Keith, Westinghouse tester, is shown making adjustments on the big protective device. During the past year, Westinghouse has produced an all-time record number of such breakers with an interrupting capacity ranging from 15,000 volts to 230,000 volts.