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What is the maximum size branch breaker that can be installed in an NF panel with a 400a main breaker?

Issue:
Maximum branch breaker and subfeed breaker that can be installed on a 400amp NF panel.

Product Line:
Panelboards

Environment:
NF

Cause:
Largest amp size

Resolution:
The maximum branch mounted circuit breaker is 125 amp. One or two Powerpact J frame, 250 amp maximum, sub-feed breakers can be installed use sub-feed breaker kit NF600SFBJ and the proper back box and trim.
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