The Siemens BL Circuit Breaker is a panelboard mounted, non-interchangeable trip, molded case circuit breaker. The HID series is intended for use with high-intensity discharge lamp loads having in-rush currents above the instantaneous trip setting of a standard breaker. 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.