Siemens JXD63B400H 3-Pole Molded Case Circuit Breaker

Siemens JXD63B400H is a Sentron-series three‑pole molded‑case circuit breaker rated for 400 A in 600 V‑class systems. This 3P MCCB provides thermal‑magnetic overload and short‑circuit protection for three‑phase feeders, with an interrupting capacity of 25 kAIC at 600 V and 35 kAIC at 480 V. It is rated for 600 VAC and 250 VDC, enabling use in both AC distribution and DC environments. The unit ships with a non‑interchangeable trip unit and bolt‑on mounting, with lugs not included. As part of Siemens’ JXD family, the JXD63B400H protects distribution circuits in commercial and light‑industrial installations, delivering reliable disconnection under overloads and faults. Its molded‑case construction supports durable operation in demanding environments and seamless compatibility with standard 3‑pole panels designed for 600 V‑class MCCBs, making it suitable as a main‑or feeder‑protection device in 3‑phase power systems.