Siemens JXD63B350 350A 3P 600V Circuit Breaker, Bolt-On | AmpState

Meet the Siemens JXD63B350, a robust bolt-on circuit breaker designed for everyday electrical protection in panelboards, load centers, and distribution panels. With 350 A capacity and a 3-pole configuration, this unit efficiently guards three-phase systems up to 600 V, delivering dependable performance where it matters most.

Engineered for replacements and BOM alignment, the JXD63B350 simplifies stocking spare parts—keep the original part number intact while ensuring you have a ready-to-install unit on hand for fast, reliable service calls.

Key features that matter in the field

• Bolt-On mounting delivers a secure, vibration-resistant connection for reliable operation in demanding environments.
• Three poles provide consolidated protection for multi-leg circuits, simplifying installation in three-phase systems.
• 350 A amperage supports medium-to-large load demands common in commercial and industrial panels.
• 600 V maximum voltage aligns with typical distribution systems in many facilities.
• Siemens build quality backed by the JXD63B family, known for dependable protection and long service life.

Where this breaker shines

• Panelboards and load centers in commercial buildings, data centers, and light industrial settings needing reliable single-trip or common trip protection (depending on the exact configuration in your panel).
• Replacement projects where fixtures must maintain exact original part numbers to keep BOMs consistent and avoid compatibility issues.
• Spare parts stock to minimize downtime—having the correct JXD63B350 on hand means faster responses to fault conditions.

Specifications at a glance

• Amperage: 350 A
• Poles: 3
• Voltage: 600 V
• Type: Bolt-On Circuit Breaker
• Manufacturer: Siemens
• Part Number: JXD63B350
• Availability: AmpState

How it compares to typical replacements

Unlike generic breakers, the JXD63B350 is engineered to fit Siemens panelboards and maintain alignment with the original BOM. This reduces the risk of fitment issues, minimizes rewiring or adapter needs, and supports easier maintenance schedules for facility teams.

Installation and care tips

• Confirm your panel's rating and the bus configuration before installation to ensure full compatibility and proper trip characteristics.
• Use manufacturer-recommended torque specifications for bolt-on mounting to prevent loose connections.
• For any doubt about fit or compatibility, you can message AmpState for assistance in confirming the exact match to your panel model and serial number.

Trusted support

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.