The Siemens BL Circuit Breaker is a panelboard mounted, non-interchangeable trip molded case circuit breaker available in 10-125A, 1-, 2-, and 3-pole.  Available in 10KAIC, 22KAIC and 65KAIC interrupting ratings.  Also, available are arc-fault, ground-fault and switching neutral breakers.  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.