Eaton HLD3400W - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton HLD3400W is a high-capacity, bolt-on molded case circuit breaker built to protect modern panelboards and loadcenters from overcurrent and short-circuit events. With a 400 A rating and 600 V capacity, this 3-pole unit is designed for robust three-phase distribution in residential, commercial, and light industrial environments.

Why this breaker stands out

• Secure bolt-on mounting: engineered for a rigid, vibration-resistant bus connection that stays put in busy electrical panels and in environments with vibration or movement.
• Thermal-magnetic trip unit: provides stable, repeatable protection by combining precise thermal sensing with magnetic tripping for rapid response to high fault currents.
• OEM-compatible design: designed to work seamlessly with matching Eaton OEM loadcenters and panelboards, ensuring reliable fit and coordinated protection.
• Versatile application: suitable for residential, commercial, and light industrial settings where dependable branch circuit protection and short-circuit mitigation are critical.

Technical specifications at a glance

• Manufacturer: Eaton
• Part Number: HLD3400W
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and practical scenarios

• Upgrading or expanding large electrical panels in industrial or commercial spaces where 3-phase loads are common.
• Installing in new-builds that require robust, compliant protection for critical equipment and distribution circuits.
• Replacing aging or incompatible breakers in OEM Eaton panelboards to maintain coordinated protection and trip characteristics.
• Deploying in environments with vibration—workshops, manufacturing floors, or equipment rooms—where a secure connection reduces nuisance trips.

What problems this breaker solves

• Prevents overheating and damage from overcurrent on high-capacity circuits by using a reliable thermal element paired with magnetic trip for fast fault interruption.
• Minimizes panel movement-induced disturbances with a bolt-on design that secures a strong, low-resistance bus connection.
• Simplifies installation and maintenance by aligning with Eaton’s OEM loadcenter ecosystem, reducing the risk of compatibility issues.

Practical tips for best results

• Ensure the bolt-on mounting is tightened according to your panel manufacturer’s guidelines to maximize bus stability and electrical integrity.
• Confirm that your panelboard or loadcenter is compatible with HLD-series breakers to maintain coordinated protection and expected trip curves.
• Use this 3-pole breaker in three-phase distribution circuits where balanced protection across all phases is essential for equipment longevity and safe operation.

Choose the Eaton HLD3400W when you need a dependable, high-capacity protective solution that aligns with OEM panel systems and delivers consistent, real-world performance in demanding environments.