What is the part number of the main breaker for the NQ8442B2C column width panelboard?

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Issue:
Part number of the main breaker for the NQ8442B2C column width panelboard

Product Line:
PTFDS - FD Enclosure'Systems

Environment:
NQ panelboards sold and used in North America

Cause:
Replacement main breaker for column width NQ panelboard.

Resolution:
The main breaker is a QBM32225TN.