Molded-Case Circuit Breakers - EatonExplore further
1927 Westinghouse introduced the first complete circuit breaker line, rated 10– 600A, 600V 1939 Along with ordering information and style numbers, the various maximum current ratings came to be known by frame designations: 50A E-Frame 100A F-Frame (non-interchangeable trip) 100A G-Frame 225A K-Frame 600A L-Frame
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