Eaton HLD3400Y - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton HLD3400Y is a robust 400A, 600V, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built to withstand demanding electrical environments, this unit blends precise protection with solid, durable construction that electricians can trust.

• Secure bolt-on mounting ensures a rigid, vibration-resistant bus connection, reducing the risk of loose connections in dynamic installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance across varying load conditions, helping prevent nuisance trips while guarding your circuits from faults.
• OEM compatibility designed to work with matching OEM loadcenters and panelboards, streamlining replacements and upgrades without compatibility concerns.
• Versatile application suitable for residential, commercial, and light industrial electrical environments that require reliable 400A protection.

The HLD3400Y is a three-pole device, purpose-built for branch circuit overcurrent and short-circuit protection. Its bolt-on design is ideal for panelboards and loadcenters where a solid, secure connection is essential in installations that experience vibrations or movement.

Technical snapshot

• Manufacturer: Eaton
• Part Number: HLD3400Y
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why electricians choose the Eaton HLD3400Y

When upgrading panels or configuring new installations, this breaker provides a reliable, long-term protection solution that stands up to real-world conditions. Its bolt-on design minimizes movement-induced wear, while the thermal-magnetic trip mechanism offers predictable performance—critical for systems that must stay safe and compliant under load spikes. For projects requiring OEM-compatible components, the HLD3400Y delivers a seamless fit with matching loadcenter and panelboard families, reducing install time and compatibility risk.

Ideal use scenarios

• Upgrading residential service panels to enhance feeder protection for high-load appliances or multi-zone circuits.
• Commercial electrical rooms needing dependable 400A protection for subpanels and critical branch circuits.
• Light industrial applications where vibration resistance and robust, repeatable protection are priorities.

With the Eaton HLD3400Y, you’re choosing a proven, purpose-built solution for hard-working electrical environments. Its combination of secure mounting, reliable thermal-magnetic protection, and OEM compatibility translates into fewer call-backs, quicker installs, and safer, more dependable power distribution.