What is the difference between A, B, and C suffixes on an FY type breaker?

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What do the A, B, and C suffixes indicate on an FY breaker?

Issue:
How do you complete the part number of a 1p FY breaker for an I-line panel like FY14030?

Product line:
Molded case circuit breakers

Resolution:
The A, B, and C suffixes indicate the bus connection the breaker will plug on to. The part number must have one of these suffixes to be valid.