Eaton HKD3300 - 300 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton HKD3300 — a rugged 3-pole molded case circuit breaker engineered to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. With a 300A rating at up to 600V, this device is built to handle demanding commercial and light industrial environments while remaining a reliable fit in residential service upgrades where 3-phase protection is required.

Why the HKD3300 stands out

• Compact molded-case design optimizes panel space and simplifies installation, making it an ideal upgrade or retrofit for existing panels without compromising circuit capacity.
• Thermal-magnetic trip unit combines a bimetal thermal element with a magnetic trip, delivering stable, repeatable protection against both overloads and short circuits across varying loads and temperatures. This minimizes nuisance trips while maintaining fast response to dangerous faults.
• 3-pole configuration is purpose-built for 3-phase systems, providing coordinated protection across all phases in commercial and light-industrial applications.
• OEM compatibility designed to align with matching Eaton OEM load centers and panelboards, ensuring seamless integration and reliable performance from the moment of installation.
• Versatile applicability suitable for residential, commercial, and light-industrial settings, making it a practical choice for new builds, upgrades, or service panel refreshes.

Ideal use cases

• Main or feeder protection in commercial load centers and Eaton-compatible panelboards
• Upgrading service panels that require robust 3-phase protection with a compact footprint
• retrofit projects where space is at a premium but 600V systems and 3-pole protection are needed

Technical specifications at a glance

• Manufacturer: Eaton
• Part Number: HKD3300
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 300A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical tips for use and optimization

• Ensure your panelboard is compatible with 600V and designed for a 3-pole HKD-series breaker to maintain proper clearance and safe operation.
• When replacing an existing breaker, verify that the new HKD3300 matches the OEM panel’s specifications to preserve coordination and trip performance.
• Inspect mounting and terminal torque during installation to ensure reliable electrical contact and long-term stability in environments with vibration or temperature changes.
• Pair this breaker with appropriately rated conductors and devices in the same system to maintain coordinated protection across all phases.

The Eaton HKD3300 is more than a switch—it's a carefully engineered protection solution that prioritizes precise trip performance, panel efficiency, and dependable operation in real-world electrical systems. For projects requiring robust 3-phase protection with a compact footprint and OEM-compatible integration, the HKD3300 delivers clear, practical value from day one.