Siemens Q2125S Type QP Molded Case Circuit Breaker

Siemens Q2125S Type QP Molded Case Circuit Breaker is a two-pole, 125 A protective device for 120/240 V AC residential distribution. As part of the QP/MP family, it delivers thermal‑magnetic overcurrent protection with a 10 kA interrupt rating at 240 V and is UL 489 listed. The Q2125S is available in SpeedFax low‑voltage variants and can be configured with INSTA‑WIRE terminals for fast terminations; it uses a lever actuator with a plug‑in connection for straightforward installation in Siemens panels and accepts 8 AWG to 2/0 AWG conductors in ambient up to 40°C. Its compact footprint measures roughly 3 in long by 2 in wide by 3 in high, designed to fit standard load centers and distribution panels. This model protects branch circuits or feeders in residential electrical systems where 125 A is the required protection level, and it is compatible with the Siemens QP/MP lineup for reliable, code‑compliant circuit protection in 120/240 VAC service.