Eaton WMZT3D40 40A 3-Pole 480 V Circuit Breaker

The Eaton WMZT3D40 40A 3-Pole 480 V Circuit Breaker is engineered to protect your three-phase power distribution with precision in demanding commercial and industrial environments. With the exact configuration and part number WMZT3D40, this breaker is built to integrate smoothly into Eaton-ready panels and distribution equipment, delivering dependable overcurrent protection when it matters most.

Why this breaker stands out

• 40 ampere rating provides targeted protection for feeders and motors without unnecessary disruption to normal operation.
• Three-pole design ensures simultaneous isolation of all three live conductors during a fault, reducing the risk of arcing and ensuring safer shutdown of three-phase equipment.
• 480 V maximum operating voltage aligns with standard industrial three-phase systems, motors, and process equipment, helping you safely protect higher-voltage circuits.
• Clear part identification by part number WMZT3D40 supports fast ordering, stocking, and maintenance in busy facilities.
• Purpose-built for reliability—designed to handle the demands of ongoing industrial use, delivering consistent trip performance when protection is required.

Ideal applications

• Three-phase motor circuits on manufacturing lines, conveyors, and machine tooling
• Power distribution feeders for large HVAC systems and climate control networks
• Industrial equipment mains in warehouses and distribution centers
• Critical loads in data centers or server rooms that run on 480 V three-phase power

How it fits into your system

Use the WMZT3D40 where a 3-pole, 480 V protection device is required. It slots into appropriate Eaton panels and enclosures designed for WMZ-series breakers, helping maintain consistent protection across your electrical distribution. When wiring, follow standard NEC guidelines for conductor sizing and protection with a 40 A rating, and ensure secure torque on connection points to maintain reliability over time.

Practical considerations and tips

• Match this breaker to the corresponding Eaton panel family that accepts WMZ-style, three-pole units for seamless compatibility.
• Use as part of a coordinated protection scheme with upstream fuses or breakers to optimize fault clearing and minimize downtime.
• Schedule regular inspections of connections and trip performance to preserve reliability in harsh or variable environments.