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Will a PG frame I-Line breaker fit into an I-Line interior if it has an MA frame breaker installed?

Issue:
Will a PG frame I-Line breaker fit into an I-Line interior if it has an MA frame breaker installed?

Product Line:
I-line breakers

Environment:
Molded Case Circuit Breakers

Cause:
Replacement

Resolution:
Yes, an MA or MH frame legacy breaker and a P-frame Powerpact breaker will fit in the same types of I-line interiors, per the digest. That said, P frame breakers over 800A CANNOT be installed in HCP or HCWM interiors. P frame breakers over 800A require an HCR-U. Please verify panel type before using larger amperage P-frame breakers.
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