AMERICA’S FASTEST CIRCUIT BREAKER

CD 2478088 E&MP15.007

Electric Circuits, Breakers

February 25, 1942

Th[is] picture show[s] the fastest operating oil circuit breaker in the country, recently installed by General Electric to protect power supplied from the Bonneville hydroelectric project to important war production areas in the Northwest.

The breaker will interrupt 2,500,00 KVA at 230,000 volts in three cycles, or one-twentieth of a second, if a fault occurs on the transmission system.

From this angle the man working on the breaker mechanism might be at the breech of a large cannon.

G-E IMPULSE OIL CIRCUIT BREAKER
230,000 VOLTS
600 AMPERES
TYPE FG-25

During installation in J.D. Ross Substation, Bonneville Power Administration

Original Caption by Science Service
^©General Electric