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Can a QBL breaker be used as a main breaker in a QU12L400CL?

The QBL (200 ampere maximum) can be used. However, if the QBL breaker is used, the SCCR (Short Circuit Current Rating) will drop to 10k AIC (Ampere Interrupting Capacity) even though the factory installed QDL22200 is rated for 25k AIC. The panel is UL listed for use with the QBL at the reduced SCCR.


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