Eaton KD3400Y - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton KD3400Y is a robust 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed to protect your electrical systems from overloads and short circuits. Built for dependable branch circuit protection in panelboards and load centers, this unit brings reliable performance to residential, commercial, and light industrial settings.

• Secure bolt-on mounting: delivers a rigid, vibration-resistant bus connection for stable, long-lasting protection even in dynamic installations.
• Thermal-magnetic trip unit: provides stable, repeatable protection by responding to overloads with the thermal element and short circuits with the magnetic element, reducing nuisance trips and promoting continuity of service.
• 3-pole design at 400 A / 600 V: well-suited for three-phase power distribution, offering comprehensive protection for feeders and main or branch circuits.
• OEM-compatible: crafted to work seamlessly with matching Eaton OEM load centers and panelboards for straightforward upgrades, replacements, or expansions.
• Versatile applications: ideal for residential service panels, commercial electrical rooms, and light industrial equipment feeders where reliable fault protection is essential.

Why this KD3400Y matters for your electrical system

This molded case circuit breaker combines a bolt-on mounting approach with a thermal-magnetic trip, delivering predictable protection characteristics that you can trust under real-world conditions. The rigid mounting minimizes vibration-related wear on bus connections, helping sustain performance over time in busy panel environments. In short, the KD3400Y helps protect people, property, and equipment by ensuring quick and precise isolation of fault currents while maintaining service continuity under normal operation.

Technical snapshot

• Amperage rating: 400 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Applications: Branch circuit overcurrent and short-circuit protection

Ideal for

• Residential service panel upgrades and main feeder protection
• Commercial electrical rooms requiring reliable three-phase protection
• Light industrial feeders where durable, high-ampacity protection is needed

When selecting a replacement or upgrading your protection scheme, verify compatibility with your Eaton panelboard or load center to maintain proper protective coordination and system reliability. The KD3400Y is a purpose-built solution for demanding electrical environments where dependable overcurrent and short-circuit protection matters most.