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What breakers do the old QBL and QBM panelboards use?

Issue:
What are the breakers that can be used for QBL and QBM panelboards?

Product Line:
Product sold in United States.

Environment:
QBL and QBM panelboards

Resolution:
QBL and QBM panelboards are NQOB panels. Use QOB breakers.
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