Siemens Q245 2-Pole 1-Phase Plug-In Circuit Breaker

Siemens Q245 is a 45-amp, two-pole, 120/240-volt plug-in circuit breaker in the QP family, designed for quick installation in Siemens load centers. This common-trip device protects a single 240V branch circuit by interrupting both hot legs together, with a 10,000-amp interrupt rating (10 kAIC) at 240V. It is a 2-pole, 1-phase unit with plug-in mounting and 60 Hz operation, typically fitting standard QP/MP enclosures and sized for copper conductors in the 8–6 AWG range (8–4 AWG in some wiring configurations). The breaker measures about 3 in long by 3 in wide by 2 in high and is UL listed for 120/240V AC service. A notable convenience feature is Insta-Wire compatibility for faster wiring, and it is compatible with Siemens’ QP plug-in line in compatible panels and enclosures with NEMA 1/3R rating. This model is widely used as a protective device for 240V circuits in residential or light commercial panels where a 45A break is appropriate.