UBIF0250N, Connecticut Electric,Federal Pacific, Thin Series, type UBIFN, HACR, 2P, 1PH, 50A, 120/240V, 10kA@240V, standard interrupting capacity, Plug-In, complete with trip, LI - Long-Time and Instantaneous trip functions, Thermal Magnetic, molded case circuit breakers, series corresponds to Federal Pacific Electric Stab-Lok NC two pole series