What is the catalog number of the 20a/1p branch breaker to be used in the obsolete NQOB panel rated 120/208, 3ph-4w, 10K AIC?

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Issue:
20A 1 Pole breaker to be used on NQOB Panel rated at 120/208, 3ph-4w, 10K AIC

Product Line:
NQOB Panelboard

Environment:
Products sold and used in the United States

Cause:
Selection / Installation

Resolution:
Use the QOB120