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What is a "sealed breaker"?

A breaker is considered a sealed breaker is there is a "Factory Sealed" label on the side seam of the breaker. Sealed breakers are usually suitable for reverse feeding, but installation of internal accessories in the field will void that listing. All G-Frame and F-frame circuit breakers are sealed breakers, and of the remaining Series C breaker, the B prefix in the part number (JDB, KDB, HLDB, etc.)  indicates a sealed breaker.