Eaton KD3400S09 Circuit Breaker, 400A, 3-Pole

Meet the Eaton KD3400S09, a rugged 400 A, 3-pole circuit breaker designed for demanding industrial electrical service, maintenance, and replacement projects. Built to protect your distribution network from overloads and short circuits, this Eaton device delivers dependable protection and straightforward integration in both new installations and upgrades.

• 3-pole protection for three-phase systems: Balanced fault protection across all phases in manufacturing lines, warehouses, and facility service panels.
• High-current capability: 400 A rating provides robust protection for heavy-load feeders and main service conduits, reducing the risk of equipment damage.
• Part-number driven compatibility: Use KD3400S09 to confirm the exact fit for your panel, busbar arrangement, and upstream devices. Always verify fit by part number and application requirements.
• Industrial-grade reliability: Engineered by Eaton to withstand the demands of continuous operation in industrial environments, with dependable trip performance when faults occur.
• Replacement and upgrade-ready: Ideal for replacing aging breakers or upgrading service capacity in mid- to large-scale electrical infrastructure.
• Support when you need it: If you're unsure about compatibility, our team is ready to help verify fit and recommend the best installation approach.

Specifications at a glance:

• Manufacturer: Eaton
• Part Number: KD3400S09
• Product Type: Circuit Breaker
• Amperage: 400 A
• Poles: 3

Practical tips for selecting and using this breaker:

• Always confirm the exact part number against your panel or distribution equipment before purchase to ensure proper fit and performance.
• Coordinate with your facility's protection scheme—three-phase systems typically require balanced protection across all legs, which a 3-pole breaker provides.
• Consult a licensed electrician for installation to meet electrical codes and safety standards.
• For replacements, compare the KD3400S09 against the existing breaker’s frame size and mounting configuration to ensure seamless compatibility.