Eaton hkd3400 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton HKD3400 is a rugged 400 A, 600 V, 3-pole molded-case circuit breaker designed to protect branch circuits and withstand the demands of panelboards and loadcenters. Built for dependable overcurrent and short-circuit protection, this unit is a smart upgrade or replacement choice for evolving electrical systems in residential, commercial, and light industrial settings.

• Compact molded-case design maximizes panel space, helping you fit more circuits in the same enclosure without sacrificing protection.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance across varying loads and fault conditions, providing precise coordination with other devices in the same panel.
• 3-pole configuration ensures balanced protection for 3-phase systems and reduces wiring complexity, ideal for motor loads and commercial applications.
• OEM-loadcenter compatibility engineered to pair with matching Eaton loadcenters and panelboards for straightforward installation and reliable operation.
• Versatile application suitable for residential, commercial, and light industrial environments where robust 400 A protection is required.

Technical snapshot

• Manufacturer: Eaton
• Part Number: HKD3400
• Type: Thermal-magnetic molded-case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker matters in real-world installations: for panel upgrades or new builds in spaces with significant electrical demand, the HKD3400 provides reliable protection for feeders and branch circuits. Its thermal-magnetic trip responds quickly to short circuits while maintaining stable operation during normal load fluctuations, reducing nuisance trips and helping protect downstream equipment such as pumps, conveyors, and lighting systems.

Ideal use scenarios

• Upgrading a residential or small commercial service panel where 3-phase loads or large motor circuits require solid protection.
• Replacing aging breakers in Eaton-compatible panelboards to restore protection continuity and panel reliability.
• Feeding critical equipment in light industrial environments where space efficiency and robust fault protection matter.

For buyers at AmpState, the HKD3400 represents a dependable, OEM-aligned choice that aligns with established Eaton panel systems. When selecting this breaker, consider the specific load requirements, ensure compatibility with your panelboard model, and follow proper installation practices to maintain safe, code-compliant operation. Keep a spare HKD3400 on hand for maintenance planning, and verify correct torque on terminations to preserve connection integrity over time.