Siemens QJ23B150 3 Pole 150 Amp Circuit Breaker

Siemens QJ23B150 is a three-pole, 150 A molded‑case circuit breaker from the QJ2 family, intended for 240 V AC service. It uses a thermal‑magnetic trip with a trip‑free mechanism to shut down a circuit when overload or short‑circuit conditions occur, protecting downstream wiring and equipment. With a 10 kA interrupt rating at 240 V (10 kAIC), this unit is designed for low‑voltage distribution panels and provides protection for three‑phase circuits up to 150 A. The QJ23B150 features standard line and load terminations for straightforward wiring in panelboards and distribution gear and is compatible with Siemens’ legacy QJ2/QJ frames used in ITE/SIEMENS installations. In typical commercial and light‑industrial applications that run on 240 V, it serves as a reliable branch‑circuit or feeder breaker, helping maintain electrical safety and system reliability by isolating faults quickly and predictably. As part of the Siemens molded‑case breaker lineup, the QJ23B150 delivers the established protection characteristics of the QJ family, making it a common choice for upgrading or replacing older ITE/Siemens devices in 3‑phase 240 V environments.