What does the "R" indicate in a legacy breaker part number such as FAR, FHR, KAR, KHR, etc?

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What does the R indicate in a legacy breaker part number such as FAR, FHR, KAR, KHR, etc?

Issue:
What is the "R" in a catalog number such as FAR36030?

Product line:
Circuit breakers

Resolution:
The R indicated that breaker had a drawout construction and was used in conjunction with obsolete type DO (drawout) I-line switchboard with plug-on load side connector blocks.

The switchboard must be replaced if one of these breakers is needed.