Eaton HMCP400D5WD09 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Eaton HMCP400D5WD09 is a robust 400A, 600V, 3-pole molded‑case circuit breaker designed to deliver dependable branch circuit overcurrent and short‑circuit protection in panelboards and load centers. Built for spaces where efficiency matters, its compact molded case design helps you maximize panel real estate without sacrificing protection.

Key advantages that set it apart

• Compact molded‑case design maximizes panel space, making it ideal for dense electrical installations in residential, commercial, and light industrial environments.
• Thermal‑magnetic trip unit provides stable, repeatable protection performance, balancing nuisance trips with fast response to dangerous faults.
• Three‑pole configuration supports three‑phase systems, delivering coordinated protection for multi‑phase feeders and motors up to 600V.
• OEM‑grade compatibility designed to work with matching Eaton OEM loadcenters and panelboards, ensuring reliable fit, electrical performance, and straightforward replacement.
• High-capacity protection 400A rating makes it well suited for heavy feeders, equipment circuits, and demanding commercial applications, while maintaining safe and predictable operation.

Technical snapshot

• Manufacturer: Eaton
• Part Number: HMCP400D5WD09
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage Rating: 400A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short‑circuit protection

Ideal use cases

• Upgrading or refreshing panelboards and loadcenters in light commercial settings, where a reliable 3‑pole 400A solution is needed.
• Feeder protection for large circuits feeding HVAC equipment, commercial lighting, or motor loads in small industrial environments.
• Replacement for aging or incompatible breakers within OEM panels that require a precise Eaton fit and performance profile.

Why this matters in practice

Choosing the HMCP400D5WD09 means prioritizing predictable protection for critical electrical feeders. The thermal‑magnetic trip mechanism reduces the likelihood of nuisance trips during normal inrush events while still delivering instantaneous disconnection for short‑circuit faults. Its compatibility with Eaton OEM loadcenters means you won’t fight fitment or performance issues during installation, helping projects stay on schedule and within code compliance for residential, commercial, and light industrial applications.

Installation and compatibility tips

• Verify that your panelboard or load center is designed to accept molded‑case breakers from Eaton’s HMCP family to ensure proper mechanical fit and electrical performance.
• Follow standard electrical practices and NEC guidelines when wiring: secure connections, appropriate torque, and verify correct phase alignment for three‑phase systems.
• Use it as a dedicated protection device for feeders and large branch circuits where a stable 400A protection level is required.