Siemens Q315 Molded Case Circuit Breaker

No. The Q315 is a 3-pole circuit breaker that requires three separate hot bus connections. It is strictly designed for 3-phase Siemens load centers and panelboards.

This plug-on breaker fits Siemens 3-phase PL series and ES series load centers, as well as Siemens P1 panelboards. Check the wiring diagram inside the panel door to verify QP series compatibility.

Yes. Siemens manufactures the Q315 as the exact, UL-listed replacement for the obsolete Murray MP315 3-pole breaker.

The standard industrial cross-reference part number for this breaker is 3CNJ7.

This breaker requires three adjacent 1-inch spaces, occupying a total of 3 inches of unit space on a 3-phase bus.

Insta-Wire means the terminal lug screws are shipped from the factory in the backed-out position. This saves installation time by allowing immediate insertion of 14-6 AWG copper or aluminum wire.

No. The Q315 uses a standard plug-on connection that snaps directly onto the panel bus bars.

Yes. This circuit breaker is HACR rated, certifying it for use with heating, air conditioning, and refrigeration equipment requiring 15-amp, 3-phase protection.

No. The Q315 provides standard thermal-magnetic protection with long-time and instantaneous trip functions. It is not a GFCI, AFCI, or dual-function breaker.

No. Unless a specific competitor panel label explicitly lists Siemens QP breakers as a UL-classified replacement, installing them in panels from brands like GE or Square D voids the UL listing and creates a fire hazard.