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Will the H or J frame I-Line breakers fit into the J250 enclosures?

Issue:
Product Design Features

Product Line:
Circuit Breaker Enclosures

Resolution:
No. I-Line breakers can only be mounted into I-Line panelboards, not individual enclosures. Only lug in - lug out versions of circuit breakers can be used in individually mounted enclosure (e.g. HGL and JGL prefixes).