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AF refers to the ampere rating of the breaker frame and AT refers to the breaker trip rating in amps. These are not breakers that you would find in your home but industrial molded case breakers. The current trips can be changed out to different values all within the same frame size.

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15y ago
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Shang Torres

Lvl 1
1y ago
how you to know the size of breaker ig given to the question is 50AT and 50AF ? how

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Q: For circuit breaker what does it mean by AF AT?
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