Will a J frame breaker fit in an NF panel that has a K frame sub feed breaker installed in it?

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Issue:
Powerpact J frame to replace Legacy K frame breaker

Product Line:
NF Panelboards

Environment:
Products sold in North America

Resolution:
No, the two circuit breakers are different sizes. The J frame breaker will not fit the old style K frame subfeed breaker kit. The new J frame sub feed breaker kit will not fit the old interior.