Siemens Q120 Miniature Circuit Breaker

Yes. Siemens phased out the Murray brand and issued official substitution documentation stating that Siemens QP breakers, like the Q120, are the approved, UL-listed replacements for Murray MP-T breakers in Murray load centers.

Yes. This breaker is HACR rated for use with heating, air conditioning, and refrigeration equipment. It is also SWD (Switching Duty) rated, meaning it can safely be used as a switch to control 120V fluorescent lighting circuits on a regular basis.

The lug terminals on the Q120 circuit breaker require a tightening torque of 25 lb-in. Always verify the torque specifications printed directly on the breaker or panel label before completing the installation.

The Q120 is designed to plug directly into Siemens PL, ES, and EQ series load centers, as well as Siemens P1 panelboards. Because Siemens acquired ITE, this breaker is also the direct backward-compatible replacement for older ITE load centers that accept EQ-P type breakers.

The Q120 is a standard full-size miniature circuit breaker that measures 1 inch wide per pole. Since it is a 1-pole unit, it will occupy exactly one 1-inch space on the panel bus bar.

No. The Q120 is a standard thermal-magnetic circuit breaker that provides short-circuit and overload protection only. If your circuit requires AFCI or GFCI protection to meet local code, you will need a specialized dual-function or AFCI/GFCI breaker instead of this standard QP model.