Siemens HJXD63B350L - 350 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens HJXD63B350L, a rugged 350A, 600V, 3-pole bolt-on molded case circuit breaker designed to protect your panelboards and load centers with unwavering reliability. Available from AmpState, this breaker is built to integrate seamlessly into Siemens-based systems and heavy-duty electrical installations.

• Bolt-on mounting delivers a rigid, vibration-resistant bus connection, reducing the risk of loose contacts and ensuring long-term electrical integrity in busy equipment rooms.
• Thermal-magnetic trip unit provides stable overload protection (thermal) and instantaneous short-circuit response (magnetic), delivering repeatable protection performance across varying loads and temperatures.
• 3-pole, 350A, 600V rating—perfect for three-phase feeder circuits and substantial branch-circuit protection in commercial and light industrial panels.
• Siemens OEM compatibility is designed to pair with matching Siemens load centers and panelboards, ensuring proper fit, labeling, and coordinated protection within an established system.
• Versatile application suitable for residential, commercial, and light industrial panel applications where high ampacity and reliable short-circuit protection are required.

Practical use cases include serving as a main or large feeder breaker in three-phase panelboards, protecting heavy-load equipment, or providing robust protection for critical distribution circuits in commercial buildings. The bolt-on design combined with a thermal-magnetic trip curve helps minimize nuisance trips while maintaining fast response to dangerous faults, keeping downtime and cooling costs in check.

• Manufacturer: Siemens
• Part Number: HJXD63B350L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 350A
• Voltage Rating:
600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why choose this breaker over alternatives? It’s engineered for seamless integration within Siemens panel ecosystems, offering a proven trip profile and a secure mounting method that maintains electrical continuity even in vibration-prone environments. For projects that demand reliable, high-capacity protection with straightforward serviceability, the HJXD63B350L from AmpState delivers peace of mind and performance you can trust.