Siemens JL3-B400 Circuit Breaker, 400A, 3-Pole, 600V

Engineered for demanding industrial environments, the Siemens JL3-B400 Circuit Breaker delivers reliable 400 A, 3-pole protection for 600 V systems. Designed for service, maintenance, and replacement projects, this JL3-B400 unit safeguards your three-phase power distribution with precision and confidence.

What makes the JL3-B400 stand out

• 400 A amperage rating tailored for high-demand industrial circuits
• 3-pole design to effectively protect three-phase systems
• 600 V maximum working voltage, suitable for industrial electrical installations
• Part Number JL3-B400 ensures exact compatibility and straightforward sourcing
• Manufactured by Siemens, a trusted name in industrial power protection
• Ideal for service, maintenance, and replacement scenarios to minimize downtime

Key specifications at a glance

• Manufacturer: Siemens
• Product Type: Circuit Breaker
• Amperage: 400 A
• Poles: 3
• Voltage: 600 V
• Part Number: JL3-B400

Ideal applications and use cases

• Industrial electrical service taps, feeders, and distribution panels requiring reliable 3-phase protection
• Maintenance outages or planned replacements where quick, compatible substitutions are essential
• Panel upgrades or expansions that demand consistent Siemens components for system compatibility
• Spare parts inventory for critical manufacturing lines where downtime costs matter

Compatibility and installation considerations

Notes: Verify fit by part number and application requirements. Need help matching a part number or confirming compatibility? Message us and we'll help.

When you choose the Siemens JL3-B400, you’re selecting a component built for reliability in demanding environments. It’s not just a breaker—it's a strategic piece of your industrial power infrastructure, designed to protect equipment, reduce downtime, and keep critical processes running smoothly. If you’re upgrading or stocking for maintenance, the JL3-B400 provides a clear path to dependable three-phase protection at 600 V.