Eaton LD3400Y - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton LD3400Y is a robust 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for real-world electrical environments, this breaker provides consistent performance when it matters most—in residential, commercial, and light industrial settings—and is readily available through AmpState.

Why the LD3400Y stands out

• Secure bolt-on mounting ensures a rigid, vibration-resistant bus connection, reducing connection wear and maintaining reliable circuit protection even in equipment with movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection across a range of operating temperatures and fault current levels, helping to minimize nuisance trips while still interrupting dangerous faults quickly.
• OEM-ready compatibility is designed to pair seamlessly with matching Eaton OEM load centers and panelboards, ensuring proper fit, timing, and performance.
• Versatility for multiple applications suited for residential installations, commercial applications, and light industrial environments that require solid, dependable 3-pole protection for three-phase systems.

Technical specifications at a glance

• Manufacturer: Eaton
• Part Number: LD3400Y
• 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

Ideal use scenarios

• New panel installations or panel upgrades in homes, office buildings, retail spaces, and light manufacturing facilities that require 3-pole 400 A protection.
• Repairs or replacements in Eaton-based panelboards and load centers where a secure bolt-on solution is preferred for long-term reliability.
• Environments with mechanical vibration or equipment movement where a rigid bus connection helps maintain consistent protection performance.

Installation and compatibility guidance

For best results, pair the LD3400Y with compatible Eaton load centers and panelboards. Follow standard electrical installation practices for bolt-on molded case breakers, ensuring proper alignment with bus bars and secure mounting to prevent any loosening over time. Use the data plate and OEM guidelines as your reference for torque and connection integrity to sustain optimal protection characteristics.

What you gain with the LD3400Y

• Reliable protection for critical circuits without frequent nuisance trips, thanks to the thermal-magnetic trip mechanism.
• Long-term durability in environments with vibration or movement, thanks to secure bolt-on mounting.
• Peace of mind from OEM-compatible design that ensures proper fit, trip coordination, and performance within Eaton systems.
• A scalable solution for three-phase distribution needs, suitable for a range of commercial and light industrial applications.