Eaton | KD3400W | Circuit Breaker | 400A | 3-Pole

Meet the Eaton KD3400W Circuit Breaker — a robust solution engineered for heavy-duty power protection. With a 400A rating and arranged as a 3-pole device, it’s designed to handle demanding three‑phase applications in commercial and industrial panels while safeguarding critical equipment and wiring.

This breaker is purpose-built for maintenance, retrofit, and replacement projects where exact compatibility matters. The KD3400W part number is the best reference to ensure a correct fit within Eaton’s panel lineup, making it easier to preserve system integrity during upgrades or service work.

• 400A protection suitable for high‑current feeders and three‑phase circuits, helping prevent overcurrent damage to wiring and equipment.
• 3‑pole design protects all three hot conductors in a three‑phase system with a single device, simplifying installation and reliability.
• Exact compatibility cue use the KD3400W part number as the primary reference to confirm fit and ratings before ordering.
• Versatile application ideal for routine maintenance, retrofit projects, or replacement in panels that require Eaton protection devices.

Ideal use cases

• Replacing worn or obsolete breakers in three‑phase Eaton panels that specify a 400A, 3‑pole unit.
• Retrofits or upgrades where maintaining panel consistency and compatibility is essential for safe, reliable operation.
• Protection for large motors, feeders, and distribution buses within industrial or commercial electrical systems.

Compatibility and installation tips

• Before ordering, confirm fit and ratings by cross‑checking the KD3400W part number against your panel documentation.
• Ensure a licensed electrician handles mounting, wiring, and testing to align with panel bus type and electrical requirements.
• Keep a spare KD3400W on hand in a dry, accessible location and clearly label it for quick maintenance interventions.

Chosen for reliability within Eaton’s ecosystem, the KD3400W delivers confident protection for high‑current, three‑phase applications. It’s the practical, standards‑aligned choice when you need precise compatibility, straightforward installation, and durable performance in demanding environments.