Molded Case - Previous Generation Circuit Breakers are ABB’s legacy molded case circuit breakers, including Q-Line, E-Line, F-Line, THLC, K-Line, TJ, and TK series (with VersaTrip and SelecTrip), as well as Mag-Break motor circuit protectors. These breakers are no longer actively manufactured, but spare parts and support remain available. Archived documentation is located in the "Publications" section on the right side of the webpage. They are used in industrial, commercial, and residential power distribution systems, offering high reliability and compatibility.