Siemens MBK100 100-Amp Two Pole Main Circuit Breaker for EQ Type Load CentersSiemens main breaker kits are used as a replacement main breaker in Siemens type EQ load centers. Type EQ load centers were produced prior to 2002. Check the load center wiring diagram for confirmation, the MBK200 is the equivalent to the EQ9685. 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