Eaton KD3400W - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton KD3400W is a rugged, bolt-on molded case circuit breaker designed to safeguard your panelboards and load centers with decisive, reliable protection. With a 400 A rating and 600 V capacity, this 3-pole device is built to handle demanding branch circuits in residential, commercial, and light industrial environments.

Key advantages that keep circuits safe and steady

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that minimizes movement, arcing, and connection fatigue in demanding installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection across temperature changes, responding quickly to overloads and short circuits to prevent equipment damage.
• 3-pole design ideal for 3-phase systems, enabling reliable protection for larger motors, feeders, and distributed loads.
• OEM-compatible compatibility with matching Eaton OEM load centers and panelboards, ensuring a seamless, trouble-free replacement or upgrade.
• Versatile application suited for residential, commercial, and light industrial settings where dependable branch-circuit protection is essential.

Technical snapshot

• Manufacturer: Eaton
• Part Number: KD3400W
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

Use the KD3400W in service panels and distribution boards where robust 3-phase protection is needed. It’s well-suited for protecting large motors, three-phase feeders, and critical branch circuits in commercial spaces, light industrial facilities, and multi-residence buildings. When reliability and ease of installation matter, this bolt-on breaker provides a dependable, maintenance-friendly solution.

Why this matters for you

Choosing the KD3400W means prioritizing long-term reliability and safety. The secure mounting minimizes vibration-induced issues, while the thermal-magnetic trip unit delivers consistent performance that electricians can trust under varying environmental conditions. If you’re upgrading or replacing a breaker in an OEM-compatible panel, this unit is designed to fit and function as intended, reducing downtime and the complexity of panel maintenance.

Who should consider it

• Electrical contractors working on panelboard installations or upgrades in commercial and light industrial settings
• Facility managers overseeing distributed electrical systems with 3-phase loads
• Residential developers implementing three-phase service or large motor circuits in common-area equipment

With the Eaton KD3400W, you gain a trusted, purpose-built solution for protecting your critical electrical infrastructure—combining solid mechanical design, precise protection, and effortless compatibility with Eaton’s panel ecosystems.