AMERICAS 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
During installation in J.D. Ross Substation, Bonneville Power Administration
Original Caption by Science Service