SJK3F400 | Circuit Breaker | 400A | 3-Pole | 600V

The SJK3F400 is a rugged industrial circuit breaker engineered for demanding electrical environments. With a 400A rating, three-pole construction, and a 600V capacity, this unit delivers reliable three-phase protection for high-current systems—from heavy machinery to centralized power distributions.

Key benefits you’ll feel in real-world operations:

• Precise three-phase protection: The 3-pole design safeguards all three phases, helping prevent imbalances that can stress motors and drives.
• High-current reliability: At 400A, this breaker is built to interrupt and isolate faults in heavy-load circuits, keeping equipment safe and downtime minimal.
• Versatile industrial compatibility: Suited for distribution panels, motor control centers, and retrofit projects where 600V systems are standard.

Specifications at a glance

• Amperage: 400 A
• Poles: 3-Pole
• Voltage: 600 V
• Part number reference: SJK3F400

Why this unit stands out for maintenance, retrofit, and replacement

• Maintenance-ready design: Built to endure routine cycling in service entrances and enclosures, making it a dependable choice for ongoing upkeep.
• Retrofit-friendly: When upgrading panels or replacing aging breakers, the SJK3F400 aligns with common 3-phase architectures and 600V deployments, reducing installation surprises.
• Clear compatibility reference: The part number SJK3F400 is the most reliable guide for matching your panel, bus design, and protective coordination.

Practical guidance for best results

• Always confirm fit and ratings before ordering. Use the SJK3F400 as your primary compatibility reference to avoid mismatches.
• Plan for proper coordination with neighboring protective devices to ensure selective tripping and minimal disruption during faults.
• Inspect mounting and termination styles in your enclosure prior to installation to ensure secure, code-compliant connections.

Whether you’re upgrading an existing installation, retrofitting a legacy panel, or stocking spares for critical lines, the SJK3F400 delivers dependable 400A, 3-Pole, 600V protection with a focus on longevity and operational continuity. For the right fit, reference your OEM documentation and verify that this exact part number matches your panel and distribution design.