SIEMENS space saving, plug in circuit breakers are intended for use in SIEMENS EQ, SIEMENS Ultimate, ITE, and Gould load centers and meter combinations that are rated to accept type QT breakers. Check wiring diagram to confirm. To ensure the on a SIEMENS panel is not voided, the use of SIEMENS breakers is required. The quadplex breakers provide two double pole breakers in half the space of standard sized breakers. These triplex, 1/2-Inch frame breakers are ideal when new circuits are required in a panel that has no available spaces..Siemens space saving, plug in circuit breakers are intended for use in Siemens EQ, Siemens Ultimate, ITE, and Gould load centers and meter combinations that are rated to accept type QT breakers. Check wiring diagram to confirm. To ensure the on a Siemens panel is not voided, the use of Siemens breakers is required. The quadplex breakers provide two double pole breakers in half the space of standard sized breakers. These triplex, 1/2-Inch frame breakers are ideal when new circuits are required in a panel that has no available spaces. Siemens strongly recommends against the use of "used" breakers. The installation of used breakers in a Siemens panel will void the on the panel. Siemens does not sell used breakers and has not approved any 3rd party sellers to do so.