Siemens QRH23B150 Molded Case Circuit Breaker

Siemens QRH23B150 is a three‑pole, 150 A molded‑case circuit breaker from the QRH2 family, designed for 240 V AC systems. It uses a thermal‑magnetic trip to provide long‑time and instantaneous protection for 3‑phase circuits, making it suitable for branch circuits feeding motors, feeders, and distribution panels in commercial and light industrial environments. The device delivers a 25 kA RMS symmetrical interrupting capacity at 240 V, enabling safe interruption of fault currents typical in moderate installations. The QRH23B150 is HACR‑rated, aligning with HVAC and other equipment that require HACR‑designated protection, and it is intended for Siemens QR series panel installations within low‑voltage distribution networks. With its compact molded‑case construction, it provides reliable overcurrent protection for downstream equipment while allowing safe disconnection under fault conditions on 3‑phase circuits up to 150 A at 240 V, making it a common choice for protecting feeders to compressors, pumps, and other light‑industrial machinery in standard electrical rooms.