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Can a subfeed branch breaker be installed in a 400A Nema 3R NQ panelboard?

Issue:
400A NQ Panelboard with Subfeed Branch Breaker

Product Line:
NQ panelboards and accessories sold and supported in the USA.

Environment:
Selection

Resolution:
In a Nema 3R enclosed NQ panelboard, a 3 pole 150 amp branch breaker (QOB3150VH) is the largest branch breaker that can be installed . This is due to heat rise and the restriction with a Nema 3R enclosure.
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