Siemens QJ23B225 Three Phase Molded Case Circuit Breaker

Siemens QJ23B225 is a three-pole molded‑case circuit breaker built on the QJ2 frame, rated for 225 A at 240 VAC, designed to protect 3‑phase feeders in industrial and commercial power systems. It provides thermal‑magnetic protection with a 10 kA short‑circuit interrupt rating at 240 V, enabling reliable interruption of fault currents in typical 3‑phase distribution panels, and features long‑time and instantaneous trip functions for selective coordination. The unit includes load‑side lug terminals for straightforward wiring and is part of Siemens’ legacy QJ/ITE family, offering compatible performance with other QJ2 breakers in standard low‑voltage panels. Common applications include main feeders and branch circuits in machine rooms, warehouses, and processing facilities where consistent protection against overloads and short circuits is essential.