Eaton HKD3400W - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton HKD3400W is a 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for challenging electrical environments, this unit combines robust mounting with precise protection to keep power lines safe and systems running smoothly.

Key capabilities include a secure bolt-on mounting that creates a rigid, vibration-resistant bus connection, helping maintain consistent electrical contact even in vibration-prone installations. The thermal-magnetic trip unit provides stable, repeatable protection performance, reacting quickly to overcurrent conditions and short circuits while minimizing nuisance trips that disrupt downtime or service continuity.

Designed for seamless integration, the HKD3400W is compatible with matching OEM load centers and panelboards, ensuring straightforward replacements or upgrades without compatibility surprises. This makes it an ideal choice for residential, commercial, and light industrial applications where reliable protection and straightforward installation matter most.

• Amperage rating: 400 A
• Voltage rating: 600 V
• Poles: 3
• Mounting: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Why the HKD3400W stands out

Unlike generic breakers, the HKD3400W emphasizes a secure mechanical connection and precise protection performance. The bolt-on design reduces the risk of loose connections that can lead to hot spots or intermittent trips, while the thermal-magnetic trip mechanism delivers reliable interruption under fault conditions, helping protect both equipment and people.

Who should consider it

• Electrical contractors replacing aging or failed breakers in panelboards and load centers
• Facility managers overseeing electrical rooms in small commercial or light industrial settings
• Residential developers deploying robust, shareable electrical systems that demand consistent protection across circuits

Practical considerations and use cases

Use the Eaton HKD3400W in panelboards where a 3-pole, 400 A solution is required and OEM compatibility is important for a smooth installation. Its bolt-on mounting simplifies service scenarios, and its 600 V rating supports a broad range of distribution circuits. This breaker is well-suited for protecting main distribution feeders or large branch circuits in controlled environments where uptime and reliability are essential.

To maximize performance, pair this breaker with compatible OEM load centers and follow standard installation guidelines for bolt-on assemblies. Regular checks for secure mounting and clean bus connections will help maintain optimal protection and extend the life of the electrical system.