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Can I replace the 100A main breaker in a QO327M100 load center? I would like to install a 80A main breaker. What is the catalog number of the new breaker?

The main breaker in that panel is a QO3100VH. You could replace it with a QO380VH breaker. If ordering large quantities of these panels, the 80A main breaker can be factory installed.

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