Eaton HKD3400X - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Eaton HKD3400X, a 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed to protect your panelboards and loadcenters from overcurrent and short-circuit events. Built for reliability in demanding environments, this device delivers steady, predictable protection where it matters most.

Secure, vibration‑resistant bolt-on mounting

The HKD3400X uses a robust bolt‑on mounting design that delivers a rigid, vibration‑resistant bus connection. In spaces where equipment sees movement—think busy commercial rooms or industrial settings—this secure mounting helps prevent connection looseness and protects the integrity of your electrical network.

Thermal‑magnetic protection you can trust

Engineered with a thermal‑magnetic trip unit, the HKD3400X offers stable, repeatable protection across a wide range of fault currents. The thermal element handles sustained overloads, while the magnetic element responds quickly to short circuits, helping minimize damage to equipment and reducing downtime.

Designed for compatibility and broad applications

This 3‑pole, molded case circuit breaker is built to pair with matching OEM loadcenters and panelboards, ensuring cohesive performance in installations that prioritize reliability and code‑conforming protection. It’s well suited for:

• Residential service upgrades and multi‑load center installations
• Commercial electrical rooms and light industrial panels
• New builds and retrofit projects where dependable branch‑circuit protection is essential

Technical snapshot

• Manufacturer: Eaton
• Part Number: HKD3400X
• 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 scenarios and tips

In a three‑phase commercial panel or a multi‑meter load center, the HKD3400X ensures all phases trip together, preserving motor protection and preventing phase imbalances during faults. For residential and light industrial upgrades, it provides a durable, code‑compliant solution that reduces long‑term maintenance and replacement costs. When planning installations, align the HKD3400X with compatible OEM panels to maintain streamlined assemblies and consistent protection coordination across your electrical system.

Why choose the Eaton HKD3400X

If you need dependable, high‑current protection that stands up to vibration, heat, and daily wear, the HKD3400X delivers. Its bolt‑on architecture, thermal‑magnetic trip logic, and OEM‑friendly compatibility translate into faster installations, fewer call‑backs, and clearer protection strategies for your electrical infrastructure. For projects demanding robust, long‑lasting branch‑circuit protection in panelboards and loadcenters, this is a purpose‑built choice that aligns with professional standards and practical outcomes.