Eaton LA3400PRF - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton LA3400PRF is a high-capacity, bolt-on molded-case circuit breaker engineered to protect every stage of your electrical system. With a 400A rating and a 600V capacity, this 3-pole device delivers reliable branch circuit overcurrent and short-circuit protection for panelboards and load centers in demanding environments.

Why the LA3400PRF stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, helping maintain consistent electrical contact and reducing the risk of loose connections in commercial or industrial settings.
• Thermal-magnetic trip unit combines precise thermal sensing with instantaneous magnetic protection, delivering stable, repeatable protection performance across a wide range of loads and fault conditions.
• OEM-compatible design is engineered to pair with matching Eaton load centers and panelboards, ensuring proper fit, alignment, and labeling for streamlined installations.
• Three-pole protection ideal for 3-phase systems, offering coordinated protection for critical feeders and distribution circuits in larger panel assemblies.
• Broad application range suitable for residential, commercial, and light industrial applications, making it a versatile solution for service entrances, main feeders, and branch circuits.

Ideal applications and real-world use cases

In a commercial office building, the LA3400PRF can protect essential 3-phase feeders feeding HVAC, lighting, and power distribution panels. In light industrial settings, it serves as a robust main or sub-feed breaker for equipment clusters and production lines. For residential complexes with three-phase distribution, this breaker ensures dependable protection where space and reliability matter most. Its 600V rating accommodates typical industrial and commercial networks, while the 400A capacity supports substantial load demands without compromising safety.

How this breaker protects your system

The combination of thermal and magnetic trip mechanisms means the LA3400PRF responds quickly to short circuits and also tolerates temporary overloads without nuisance trips. This balance helps minimize downtime and equipment wear, preserving the life of connected gear. The bolt-on design further enhances reliability by maintaining a solid mechanical and electrical connection even in environments with vibration or movement.

Compatibility, installation tips, and best practices

Choose the LA3400PRF when you’re working with compatible Eaton OEM panelboards or load centers that require a 3-pole, bolt-on molded-case breaker. For best results, install following the manufacturer’s guidelines for bolt torque and mounting alignment, and verify that the panelboard labeling reflects the 400A, 3-pole protection provided by this unit. Since it’s designed for robust, long-term service, periodic inspection of mounting integrity and electrical connections is recommended as part of routine panel maintenance.

Engineered by Eaton and available through AmpState, the LA3400PRF delivers a dependable, purpose-built solution for serious protection in modern electrical installations. If you’re upgrading or expanding a panelboard in a commercial or light industrial setting, this 400A, 600V, 3-pole bolt-on breaker offers a precise fit, strong performance, and peace of mind in demanding environments.