Murray MP23020 One 30-Amp Double Pole Two 20-Amp Single Pole Circuit Breaker
Murray space saving, plug in circuit breakers are intended for use in Murray load centers and meter combinations that are rated to accept type MH-T breakers.  Check wiring diagram to confirm.  To ensure the warranty on a Murray panel is not voided, the use of Murray 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.