Eaton Cutler-Hammer HKD3400F 400A 3P 600V Circuit Breaker | AmpState

Eaton Cutler-Hammer HKD3400F is a rugged 400 Amp, 3-pole circuit breaker engineered for dependable circuit protection in panelboards, load centers, and broader electrical distribution. Built for everyday electrical work, it shines in retrofit projects and maintenance planning, especially when the part number needs to stay consistent to avoid downtime and sourcing confusion.

• Part-number consistency for retrofit and maintenance: keep your sparing intact and simplify procurement by sticking with the HKD3400F across upgrades and service intervals.
• High-current protection: 400 A rating provides robust main or feeder protection for commercial or light industrial installations.
• Three-pole design for 3-phase systems: reliable protection for three-phase networks up to 600 V, helping maintain balanced protection across all phases.
• Seamless compatibility: designed to integrate with Eaton panelboards and distribution gear, supporting coordinated protection in established systems.
• In-stock availability and expert support: AmpState currently offers this model; if you’re unsure about compatibility, we’re ready to help confirm fit and ensure a proper match for your panel or distribution setup.

Ideal use cases

• New installations in 600 V, three-phase environments requiring solid 400 A protection.
• Retrofits where the exact HKD3400F model is specified, reducing changeovers and stocking complexity.
• Facilities with planned maintenance that benefits from keeping the same part number for quick replacements and streamlined ordering.

With its proven reliability and a focus on compatibility and ease of maintenance, the HKD3400F helps you minimize downtime during upgrades and service. If you need help validating fit for your specific panel or distribution scheme, reach out—we’ll verify compatibility and guide you to the right configuration.