The Siemens type BQ Circuit Breaker is a cable-in, cable-out, non-interchangeable trip molded case circuit breaker available in 10-125A, 1-, 2-, and 3-pole.  Available in 10KAIC, 22KAIC and 65KAIC interrupting ratings. Siemens strongly recommends against the use of "used" breakers.  The installation of used breakers in a Siemens panel will void the warranty on the panel.  Siemens does not sell used breakers and has not approved any 3rd party sellers to do so.