Eaton | L3400 | Circuit Breaker | 400A | 3-Pole | 600V

Engineered by Eaton, the L3400 circuit breaker delivers dependable protection for demanding electrical systems. With a 400A rating, 3-pole configuration, and a 600V operating capability, this breaker is built to handle high-load distribution while maintaining reliable interrupting performance during maintenance, retrofits, or replacements.

Key specifications

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V
• Part number: L3400

Why this breaker stands out

• The L3400 is designed to match Eaton's standard specifications for high-current, three-pole, 600V applications, making it a reliable choice for retrofit and replacement projects.
• The part number is the best reference for compatibility, helping you avoid ordering mistakes and ensuring a seamless swap in existing panels.
• Built to withstand the demands of commercial and light industrial electrical distribution, delivering steady performance over time.
• Ideal for updating aging panels, expanding capacity, or replacing worn-out breakers without overhauling a system.

Ideal use cases

• Main or feeder protection in 600V electrical systems where 400A, 3-pole protection is required.
• Retrofit projects replacing legacy breakers to restore reliable overcurrent protection.
• Maintenance scenarios where matching amperage, pole count, and voltage ensures minimal panel disruption.
• Industrial control panels and commercial distribution setups that demand sturdy, high-current interrupting devices.

Fit, compatibility and ordering tips

Before ordering, confirm that your installation matches the 400A, 3-pole, 600V specifications and that the panel accepts Eaton L3400 devices. When in doubt, use the part number L3400 as the primary reference to verify compatibility with your existing Eaton family and panel bus rating. If you’re replacing an identical unit, check the exact model reference on the current breaker to ensure a drop-in replacement with minimal system downtime.

Installation and safety considerations

As with any high-current electrical component, ensure the power is fully isolated before installation or service. Follow the manufacturer’s installation instructions and local electrical codes. Proper torque for terminations and secure mounting are essential for reliable operation and long service life.