Siemens QJ23B150 Bolt-On Circuit Breaker

Siemens QJ23B150 Bolt-On Circuit Breaker is a three-pole, 150-amp molded‑case protective device designed for bolt‑on mounting in QJ2 frame panels. It is rated for 240 V and offers up to 10 kA short‑circuit interrupting capacity at 240 V, providing thermal‑magnetic protection with Long‑Time and Instantaneous trip functions and load‑side lug terminals. This unit is a QJ2 frame bolt‑on variant with a non‑interchangeable trip, ensuring consistent protection characteristics across installations. For field wiring, Siemens offers lug terminal kit TC1Q250, compatible with QJ2/QJH2/QJ2H frames and supporting copper conductors from #6 AWG up to 250 kcmil (60–225 A frame range), enabling a robust, code‑compliant lug connection. The QJ23B150 belongs to Siemens’ QJ family of low‑voltage molded‑case breakers and is intended for protecting three‑phase circuits at 240 V in commercial or industrial distribution networks, with a standard 10 kA at 240 V interrupt rating and a bolt‑on mounting footprint that differentiates it from plug‑in models.