Eaton | HLDB3400C | Circuit Breaker | 400A | 3-Pole | 600V

Introducing the Eaton HLDB3400C Circuit Breaker — a robust, 400A, 3-pole device rated for 600V, purpose-built for maintenance, retrofit, and replacement in demanding electrical distributions. If your goal is reliable overcurrent protection for high-current, three‑phase systems, this breaker delivers steady performance, precise coordination, and a trusted Eaton lineage for long‑term serviceability.

Key compatibility note: Confirm fit and ratings before ordering. The HLDB3400C part number is the best reference for ensuring correct panel compatibility and seamless system integration.

What this means for your system

• High-current protection in 3‑phase layouts: 400A capacity across three poles ensures balanced protection across all phases in demanding industrial and commercial applications.
• 600V system compatibility: Designed for higher-voltage distribution scenarios, helping maintain safety and reliability in heavy-duty electrical environments.
• Maintenance, retrofit, and replacement use: Ideal when upgrading, refurbishing, or replacing legacy breakers that match the HLDB3400C specifications.

Who benefits most

Engineering teams, maintenance technicians, and facility managers responsible for large electrical rooms, industrial plants, and commercial facilities with 600V distribution will find this breaker a dependable option. It’s suited for retrofit projects where matching the HLDB3400C’s amperage, pole configuration, and voltage is essential to avoid downtime and ensure compatibility with existing panels.

Unique value you’ll notice

• Specification-driven compatibility: The HLDB3400C designation pinpoints a precise fit for systems that require a 400A, 3-pole, 600V solution, reducing the guesswork in replacement parts.
• Trusted manufacturer continuity: Built to Eaton’s engineering standards, offering predictable trip characteristics and mechanical operation that align with other Eaton components in the same distribution network.
• Streamlined maintenance workflow: By using the exact part number reference, you simplify stocking, ordering, and panel audits, helping your team stay compliant and efficient.

Practical use cases

• Replacing a failed high-current breaker in a 3‑phase 600V panel without changing the surrounding wiring or bus configuration.
• Retrofits where existing equipment requires an HLDB3400C-compatible 400A, 3‑pole, 600V solution to restore full protection.
• New installations in industrial facilities that standardize on Eaton components for consistent performance and serviceability.

Guidance for installation and care

Ensure a qualified electrician handles installation. Always verify the panel’s voltage rating and the breaker's amperage and pole configuration against the HLDB3400C before integrating it into a live system. De-energize equipment, follow lockout/tagout procedures, and consult manufacturer guidelines for torque specs and mounting procedures. Label the replacement clearly to support future maintenance and inspections.