Eaton LD3400W - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton LD3400W is a 3‑pole, bolt‑on molded case circuit breaker engineered for stubborn reliability in protection-critical panels. With a robust 400 A rating and a 600 V capacity, it handles demanding branch circuit overcurrent and short‑circuit protection in panelboards and loadcenters, making it a smart choice for residential, commercial, and light industrial electrical systems.

What sets the LD3400W apart is its combination of secure bolt‑on mounting and a thermal‑magnetic trip unit. The bolt‑on design delivers a rigid, vibration‑resistant bus connection that stays solid through ongoing operation and thermal cycling, reducing nuisance trips and maintenance headaches. The thermal‑magnetic trip mechanism provides stable, repeatable protection—responding quickly to short circuits while reliably distinguishing between temporary surges and dangerous faults.

Designed for compatibility and ease, this breaker works with matching OEM load centers and panelboards, ensuring a cohesive, dependable protection scheme across existing installations. Whether you’re upgrading an older panel or stocking parts for new builds, the LD3400W integrates smoothly with 3‑phase or single‑phase 600 V systems that require robust branch circuit protection.

Ideal use scenarios include

• Upgrading protective devices in commercial panelboards serving mechanical rooms, lighting, and office facilities
• Providing reliable circuit protection for light industrial equipment and small manufacturing lines
• Replacing worn or damaged breakers in residential or mixed-use buildings where panel longevity matters

Key benefits at a glance

• Secure bolt‑on mounting for a rigid, vibration‑resistant connection that maintains performance over time
• Thermal‑magnetic protection with predictable trip characteristics across varying loads and temperatures
• OEM‑compatible with matching load centers and panelboards for seamless installations
• 3‑pole, 400 A, 600 V design ideal for 3‑phase distribution and high‑current circuits

Technical snapshot

• Manufacturer: Eaton
• Part Number: LD3400W
• 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

Who should consider the LD3400W? Electrical professionals building or maintaining panelboards in commercial facilities, contractors stocking up for service upgrades, and facility managers seeking durable, easy‑to‑install protection for critical circuits. If you need a dependable, high‑current breaker that stays secure in tough environments and pairs with standard load centers, the LD3400W is a practical, long‑term choice.

Installation and maintenance tips: ensure the target panelboard is listed for bolt‑on 400 A, 3‑pole devices and follow manufacturer torque specifications and safety protocols. Regularly inspect connections for signs of wear, and schedule periodic testing of protective devices as part of your electrical maintenance plan.