Eaton HKD3400T56W - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Engineered for reliability in demanding electrical distributions, the Eaton HKD3400T56W is a 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. Its secure bolt-on mounting creates a rigid, vibration-resistant bus connection that stays solid even in environments with movement or equipment-induced vibration.

Why the HKD3400T56W stands out

• Rigid bolt-on mounting provides a secure, vibration-resistant connection to the panel bus, reducing the risk of connection loosening over time.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining thermal overload sensing with instantaneous magnetic trip for short circuits.
• 3-pole design supports 3-phase systems, making it ideal for commercial and light industrial applications where balanced protection is essential.
• OEM-compatible engineered to integrate with matching Eaton OEM load centers and panelboards for seamless replacement and coordinated protection.
• Versatile application suitable for residential, commercial, and light industrial environments that require robust branch-circuit protection at a high current rating.

Where and how you’ll use it

Use the HKD3400T56W as main or branch protection in panelboards and load centers that demand 400 A at up to 600 V. It’s well-suited for service panels in commercial settings or distribution panels in light industrial facilities, especially where panel movement or vibration is a consideration. Its reliability helps minimize nuisance trips while maintaining rapid response to true faults.

Technical snapshot

• Manufacturer: Eaton
• Part number: HKD3400T56W
• 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