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What is the maximum ampere rating for an MA frame breaker to be installed in an I-Line panelboard?

800A is the maximum ampere rating for an MA frame I-Line branch breaker. This would require an HCWM interior. For 900 or 1000A ratings, the NA frame size must be used. The ``N`` frame breaker would require an HCR-U interior. (The HCWM-U is obsolete.)


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