Can a 400A subfeed breaker, be added to a NF panel in the field?

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Issue:
Installation of a subfeed breaker on a NF panel.

Product Line:
Panelboard

Environment:
NF panel

Resolution:
A 400A subfeed breaker can be added to 600A and 800A interiors only and it is only available as factory assembled. This can be selected in the product selector tools.