Eaton HMDL3400 - 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton HMDL3400 — a 600V, 3-pole molded case circuit breaker designed to protect your panels with precision and reliability. Built for dependable branch circuit overcurrent and short‑circuit protection, it fits seamlessly into panelboards and loadcenters in residential, commercial, and light industrial settings.

Why this breaker stands out

• Compact molded case design saves panel space while delivering robust protection, helping you fit more circuits into the same footprint.
• Thermal‑magnetic trip unit provides stable, repeatable protection by responding to both sustained overloads and sudden short circuits, reducing nuisance trips and improving reliability.
• OEM‑level compatibility engineered to match Eaton loadcenters and panelboards, ensuring a clean, dependable fit and streamlined installations.
• 600V capability supports higher‑voltage, multi‑purpose electrical systems, making it suitable for a range of commercial and light industrial applications without compromising safety.
• Three‑pole configuration ideal for three‑phase installations or multi‑wire branch circuits where coordinated protection is essential.

What problems it solves

The HMDL3400 delivers precise overcurrent protection to prevent insulation damage, fire risk, and equipment failure caused by faults or overloads. Its compact form minimizes panel congestion, while the thermal‑magnetic trip unit reduces nuisance trips, keeping critical circuits energized and systems running smoothly.

Technical snapshot

• Manufacturer: Eaton
• Part Number: HMDL3400
• Type: Thermal‑magnetic molded case circuit breaker
• Voltage Rating: 600V
Poles: 3
• Application: Branch circuit overcurrent and short‑circuit protection

Ideal use cases

• Residential panelboards where space and reliability are priorities
• Commercial distribution panels needing robust, consistent protection
• Light industrial electrical rooms requiring dependable short‑circuit response
• Upgrades or replacements in OEM loadcenters where compatibility matters

Practical tips for installation and pairing

• Pair the HMDL3400 with compatible Eaton OEM loadcenters and panelboards to ensure a seamless fit and predictable trip characteristics.
• Assess your circuit layout to take advantage of the 3‑pole design for three‑phase or multi‑wire configurations, enabling coordinated protection across critical loads.
• Use in panels where space is at a premium, but you still need reliable protection against both overloads and short circuits.