Eaton LD3400C - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton LD3400C — a 400A, 600V, 3-pole molded case circuit breaker designed to protect your electrical system with precision and reliability. Built for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters, this unit is a practical choice for residential, commercial, and light industrial installations.

Why the LD3400C stands out

• Compact molded case design maximizes panel space without compromising performance, making it easier to fit into dense electrical layouts and retrofit projects.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining thermal overload sensing with an instantaneous magnetic trip for short circuits. This means faster response to faults and reduced nuisance tripping during normal inrush conditions.
• 3-pole configuration for 3-phase systems ensures balanced protection across all phases, ideal for motor loads, HVAC gear, and other 3-phase equipment common in commercial and light industrial settings.
• OEM panel compatibility designed to pair with matching Eaton loadcenters and panelboards, ensuring seamless installation and reliable performance within existing ecosystems.
• High amperage with robust voltage rating at 400A and 600V, suitable for feeding large branch circuits and providing strong protection where power distribution demands are substantial.

Ideal use cases and practical applications

• Primary or feeder protection in commercial electrical panels that service lighting, receptacle circuits, and small-to-midrange machinery.
• Motor control circuits in light industrial environments where 3-phase protection is essential for reliability and equipment longevity.
• Residential multi‑panel installations that demand centralized, dependable overcurrent protection for 3‑phase subpanels or resourceful distribution points.
• Upgrade projects where space efficiency and compatibility with Eaton panel hardware are priorities, helping reduce installation time and complexity.

Technical snapshot

• : Eaton
• Part Number: LD3400C
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection in panelboards and loadcenters

Why it matters for your power system

The LD3400C doesn’t just interrupt current—it provides a reliable, predictable protection strategy tailored to 3‑phase distribution. Its compact form factor frees up panel space, while the thermal-magnetic mechanism blends dependable overload protection with fast magnetic trip action during short circuits. For facilities that prioritize uptime and safety, this translates to shorter fault durations, reduced equipment damage, and clearer fault diagnostics for quick maintenance.

Tips for optimal use

• Verify panel compatibility with Eaton OEM loadcenters and panelboards to ensure a clean, trouble-free installation.
• Plan for future capacity by selecting a 3-pole device that aligns with your 3-phase loads and feeder configurations.
• Label the circuit clearly and document trip settings in your electrical drawings to simplify maintenance and future upgrades.