Siemens HJ3-B400 Circuit Breaker, 400A, 3-Pole, 600V

For demanding industrial protection, the Siemens HJ3-B400 Circuit Breaker delivers reliable three-phase protection with rugged, dependable design. With a 400 A rating, a 3-pole configuration, and a 600 V maximum, it is built to handle the fault currents and operational stresses common in industrial service, maintenance, and replacement projects.

• Exact fit guaranteed by part number: Use the HJ3-B400 to confirm compatibility with your panel, MCC, or electrical cabinet. Verify fit against your application requirements to ensure proper protection and seamless integration.
• Three-pole protection for balanced systems: Intercepts faults across all three phases simultaneously, improving safety and limiting damage in three-phase circuits.
• 600 V maximum rating: Suitable for typical industrial power networks and motor-driven equipment up to 600 V.
• Robust reliability for downtime-critical environments: Siemens engineering provides predictable trip performance and long service life in challenging facilities.
• Replacement-friendly design: Engineered to drop into existing equipment with minimal downtime when upgrading or replacing older breakers.

Specifications at a glance:

• Part Number: HJ3-B400
• Product Type: Circuit Breaker
• Amperage: 400 A
• Poles: 3
• Voltage: 600 V

Ideal use cases:

• Industrial electrical service installations, upgrades, and routine maintenance in manufacturing facilities
• Replacement of aging breakers in panelboards and motor control centers (MCCs)
• New builds or relocations that require robust three-phase protection for heavy machinery and conveyors

Compatibility and support:

Note: Verify fit by part number and application requirements to ensure optimal performance. If you need help matching a part number or confirming compatibility, message us and we’ll assist in confirming the right fit for your equipment.