Eaton HLD3400X - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Eaton HLD3400X is a 400A, 600V, 3-pole bolt-on molded case circuit breaker designed to deliver reliable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Built for demanding environments, this unit maintains dependable protection across residential, commercial, and light industrial applications.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection for long-term reliability in panels subjected to movement or vibration.
• Thermal-magnetic trip unit combines precise thermal delay with instantaneous magnetic actuation, delivering stable, repeatable protection across a range of load conditions and fault scenarios.
• OEM-compatible designed to integrate seamlessly with matching Eaton OEM load centers and panelboards, ensuring predictable performance and straightforward replacement or upgrade paths.
• Three-pole design delivers true three-phase protection for balanced loads and critical equipment in commercial and light industrial settings.
• Versatile applications ideal for upgrading or installing panelboards and load centers that require robust 400A, 600V protection in a compact bolt-on form factor.

Use cases include panel modernization in multi-residential or commercial buildings, service panels for light industrial machinery, and new installations where secure bus connections and reliable trip performance are essential. If you’re upgrading an existing Eaton-compatible system or configuring a new three-phase distribution setup, the HLD3400X provides the dependable protection you need with a straightforward bolt-on installation.

Why this breaker matters: the bolt-on mounting reduces movement-related wear and arcing, while the thermal-magnetic trip unit ensures consistent protection without nuisance trips during variable loads. By matching OEM panelboards and load centers, it helps preserve system integrity and simplifies maintenance in the field.

Technical specifications

• Manufacturer: Eaton
• Part Number: HLD3400X
• 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