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What is the difference between FA and FY I-Line breakers?

Issue:  
Can I use an FY 1p I-line breaker to replace an FA 1p I-line breaker?

Product Line:  
I-line Molded case Circuit Breakers

Environment:
Legacy I-line FA and FY breakers

Resolution:
FY breakers are available from 15-30 amp one pole only and the 15 and 20 amp versions are SWD (switch duty) rated. These are generally used for lighting loads in I-Line 277V applications.
FY breakers have a 14k AIC rating at 240v or 277v.
FA breakers are available from 15-100A, and have an 18k AIC rating at 240v or 480Y/277v, but are not SWD (switch duty) rated.
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