Siemens Q350 Molded Case Circuit Breaker

The Q350 is a Type QP breaker. It is approved for use in Siemens PL, ES, PN, and SN series load centers, as well as compatible I-T-E panelboards that accept plug-on Type QP breakers. Always verify compatibility by checking the wiring diagram label inside your panel door.

This Type QP circuit breaker uses a standard 1-inch per pole format. Because it is a 3-pole device, it requires three adjacent 1-inch spaces (3 inches total) on the panel bus.

Yes. Siemens acquired both I-T-E and Murray. The Siemens Q350 is the direct replacement for older I-T-E 50 Amp, 3-pole Type QP breakers and serves as an exact substitute for discontinued Murray MP350 breakers, provided your panel label permits Type QP installations.

Yes, this breaker is HACR rated by UL. This means it is certified for use with heating, air conditioning, and refrigeration equipment that requires HACR rated overcurrent protection.

The 10,000 Amps Interrupting Capacity (10kAIC) indicates the maximum fault current the breaker can safely interrupt at 240VAC without sustaining catastrophic damage. This rating is standard for most residential and light commercial distribution systems, but you must ensure your available fault current does not exceed 10kA.