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 warranty on a Siemens panel is not voided, the use of Siemens breakers is required. The duplex breakers provide 2 Single Pole breakers in the space typically required for only one standard breaker. These duplex, 1/2 in. frame breakers are ideal when new circuits are required in a panel that has no available spaces. The non-current limiting breakers are designed for use in Siemens panels manufactured prior to 1968. Siemens type QT dual circuit breakers are 1 in. wide and consist of (2) 1-pole breakers, in varying combinations of ampere ratings from 15 to 30 Amp. Type QT quad circuit breakers are 2 in. wide and consist of either (1) 2-pole and (2) 1-pole or (2) 2-pole breakers. 2-pole constructions range from 15-50 Amps and are available with internal common trip. All type QT circuit breakers are plug-in style and load terminals are provided with the units. They are rated for 120/240-Volt AC and calibrated for 40C maximum ambient applications. The standard interrupting rating is 10k AIC.