Connecticut Electric UBITB-A250 New Challenger MH250 Type-A Replacement. Two Pole 50 Amp Clip Circuit Breaker Manufactured Replacement Challenger MH250 Type A circuit breaker manufactured new by Connecticut Electric For use in Challenger Type A circuit breaker panels Intertek ETL Listing to UL Standard 489-Molded case circuit breakers 10,000 AIC 50 Amp 120/240 VAC 2 Pole breaker 1" thin type breakers Plug in type May also be branded: Murray, Crouse-Hinds, or Sylvania