What do the I-Line interior part numbers mean?

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Issue:
Interior part numbers for I-line Panelboards.

Product Line:
I-Line Panelboards

Environment:
Product Selection and Characteristics.

Resolution:
Example: HCM3691-6M, this is a panel with 72 total inches of mounting space, that goes into a 91`` box, and has a 600 amp main breaker installed.

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