Eaton HKD3100 - 100 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton HKD3100 — a robust 3-pole molded case circuit breaker rated at 100 A and 600 V. Built for dependable branch-circuit protection and short-circuit safety in panelboards and loadcenters, it's a smart choice for electricians upgrading residential, commercial, or light industrial panels.

Why this 3-pole breaker stands out

• Space-efficient, molded-case design: Compact footprint reduces panel crowding and leaves room for future expansions.
• Thermal-magnetic trip unit: Combines thermal overload protection with magnetic short-circuit sensing for stable, repeatable protection across fault types.
• Three-phase readiness: 3-pole configuration is ideal for distributing protection across a three-phase system, helping maintain balance and protect each leg.
• High voltage compatibility: 600 V rating supports common commercial and industrial distribution networks.
• OEM-compatible installation: Specifically designed to be compatible with matching OEM loadcenters and panelboards, ensuring proper fit and performance without custom adaptations.
• Ideal applications: Perfect for protecting branch circuits in residential subpanels, light commercial panels, and simpler industrial installations where reliable overcurrent protection is essential.

Technical snapshot

• Manufacturer: Eaton
• Part number: HKD3100
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 100 A
• Voltage rating: 600 V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

How it helps you work smarter

With the HKD3100, you get predictable protection that simplifies panel design and maintenance. The combination of a compact form factor and OEM compatibility means fewer surprises during installation and faster service when circuits need upgrading or expansion. Its thermal-magnetic trip unit reduces nuisance trips due to minor inrushes while still delivering decisive protection during severe faults—helping protect wiring, devices, and occupants.

Practical tips for use

• Match the breaker rating to the circuit ampacity and wire sizing in your panel schedule to ensure code-compliant protection.
• Ensure the panelboard or loadcenter is rated for 600 V systems and that the HKD3100 is the correct three-pole configuration for your load.
• When replacing an existing breaker, confirm the replacement part number aligns with the OEM panel to maintain compatibility and warranty coverage.
• Periodically inspect for signs of overheating, corrosion, or loose connections at the terminals and torque requirements per panel manufacturer guidelines.