Connecticut Electric TB UBITB150C UL Classified Circuit Breaker, 1-Pole 50-Amp 1 Pole, 50 Amp Type UBITBC is UL Classified for use in Challenger, General Electric, Murray, Siemens, Thomas & Betts and Westinghouse load centers Requires one 1-inch space Direct replacement for BR150, C150, MP150, Q150, THQL1150, or TB150