Siemens NSB Q2150B Molded Case Circuit Breaker

Siemens NSB Q2150B is a 150 A, two‑pole molded‑case circuit breaker for 120/240 V AC, part of the QPP family with Insta Wire quick‑connect terminals. It uses a thermal‑magnetic trip system and carries a UL 10 kA interrupt rating at 120/240 V, delivering reliable protection for feeders and branch circuits in residential and light commercial panels. This plug‑in unit is listed in the 2‑pole Q2125B–Q2225B family and is specifically configured for 150 A service, with standard QPP wiring options to simplify field connections. Typical applications include safeguarding residential distribution circuits and small commercial feeders that operate on 120/240 V AC.