The primary difference lies in their application and UL listings: Type BR breakers are standard residential circuit breakers manufactured by Eaton for use in Eaton BR load centers and select legacy panels. Type CL breakers are "classified" replacement breakers engineered by Eaton specifically to be safely installed as legal, UL-listed replacements inside older, competing legacy brand panels (such as Challenger, FPE, or Crouse-Hinds) where original brand breakers are no longer available.
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