Siemens Q21530CT 30-Amp Double Pole Two 15-Amp Single Pole Circuit Breaker
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 triplex breakers provide two single pole and one double pole breakers in half the space.  These triplex, 1/2-Inch frame breakers are ideal when new circuits are required in a panel that has no available spaces.