Eaton LD3400X - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Eaton LD3400X—a 400A, 600V, 3-Pole Bolt-On Molded Case Circuit Breaker built to protect your panelboards and loadcenters with unwavering reliability. This unit is designed for dependable branch circuit overcurrent and short-circuit protection, delivering durable performance in demanding electrical environments.

Why the LD3400X stands out

• Bolt-on mounting: provides a secure, vibration-resistant bus connection that stays tight and reliable in panels subject to movement or vibration.
• Thermal-magnetic trip unit: delivers stable, repeatable protection by combining timely short-circuit response with dependable overload protection, reducing nuisance trips.
• 3-pole design: ideal for 3-phase distribution up to 600V, enabling balanced protection across multiple feeders in commercial or light industrial setups.
• 400A / 600V ratings: rugged capacity to safeguard high-current branch circuits in residential, commercial, and light industrial applications.
• OEM compatibility: engineered to mate with matching OEM loadcenters and panelboards for straightforward replacements and proven performance.

Ideal applications

Use the LD3400X to shield feeders and branch circuits in a variety of settings, including:

• Residential or multi-tenant commercial panels requiring solid 3-phase protection
• Commercial distribution panels and light industrial control panels
• Panelboard retrofits or upgrades where a durable bolt-on solution is preferred

Specifications at a glance

• Manufacturer: Eaton
• Part Number: LD3400X
• 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

Practical tips for installation and use

Before installing, verify that your panelboard accepts a bolt-on 3-pole breaker and that the LD3400X’s OEM compatibility matches the existing loadcenter. The bolt-on design helps maintain a solid mechanical and electrical connection, which supports long-term reliability in environments where panels may experience movement or vibration. Use this breaker for high-current, three-phase protection needs to keep critical equipment safeguarded and running smoothly.