Siemens JXD63B350L - 350 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Siemens JXD63B350L is a 350A, 600V, 3-pole molded case circuit breaker engineered for dependable branch circuit protection in panelboards and loadcenters. Designed to fit seamlessly into Siemens-based electrical assemblies, it delivers robust protection for demanding 3-phase circuits.

Compact, space-efficient protection

The compact molded case design makes efficient use of panel space, allowing you to optimize layout in commercial or industrial panels without sacrificing protective performance.

Precise, repeatable protection with a thermal-magnetic trip

Equipped with a thermal-magnetic trip unit, the JXD63B350L provides stable, repeatable protection. It responds quickly to short-circuit conditions while minimizing nuisance tripping from normal startup surges, helping keep equipment online and operators safe.

OEM-compatible, seamless integration

Designed to be compatible with matching OEM loadcenters and panelboards, this breaker offers dependable performance and straightforward replacement within an existing Siemens ecosystem. Its trip characteristics and electrical profile are aligned with the rest of the system for consistent protection behavior.

Versatility across applications

Ideal for residential, commercial, and light industrial settings, the JXD63B350L protects large branch circuits and three-phase feeders. Use cases include protecting main feeders to subpanels, equipment circuits in service areas, and other 3-phase distribution points that require solid overcurrent and short-circuit protection at up to 350A and 600V.

Technical snapshot

• Manufacturer: Siemens
• Part Number: JXD63B350L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 350 A
• Voltage: 600 V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical considerations for installation

Before integrating, confirm compatibility with your panelboard’s frame and bus arrangement, ensure the environment matches the device’s specifications, and follow manufacturer torque recommendations for secure connections. Keeping a spare JXD63B350L on hand can streamline maintenance and load-upgrade workflows in busy facilities.

Who benefits most

• Electrical contractors deploying or upgrading 3-phase panelboards in commercial or light industrial facilities
• Facilities managers consolidating distribution with robust, long-lasting protection
• Builders and integrators seeking seamless Siemens ecosystem compatibility for simplified maintenance