Siemens HJX3B350 350A 3P 600V Circuit Breaker | AmpState

The Siemens HJX3B350 is a robust, 350 A, three-pole (3P) circuit breaker engineered for dependable protection in panelboards, load centers, and broader electrical distribution networks. With a 600 V rating, it’s built to handle demanding commercial and light industrial applications while maintaining a compact footprint in crowded electrical rooms.

Key features that help you prevent downtime and keep systems running smoothly:

• 350 A rating, 3-pole design (3P) at 600 V to protect large circuits and feeders in distribution panels.
• Part number consistency supports retrofit work and maintenance planning where the HJX3B family is already in use, reducing misfits and unnecessary edits to panel schedules.
• Siemens engineering reliability ensures compatibility with Siemens panelboards and a wide range of distribution setups.
• Availability from AmpState, with assistance to confirm fit and compatibility when you’re updating or stocking spares.

Who benefits most from the HJX3B350? Electrical maintenance teams, facilities managers, panel upgrade projects, and OEMs who need a dependable, stock-ready solution that preserves existing part numbers. It’s an ideal choice for retrofit scenarios where you must match an established cabinet or panelboard specification without re-engineering the electrical scheme.

Use cases include replacing a failed breaker in Siemens-based panelboards, upgrading to a higher current capacity in a controlled upgrade path, or stocking a reliable spare for critical distribution circuits. The HJX3B350 is purpose-built for environments where consistent part numbers and rapid procurement matter to uptime.

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