Eaton FAZ-D40/3N 40 A Molded Case Circuit Breaker

The Eaton FAZ-D40/3N is a 40A, 480V, 3-pole molded case circuit breaker built to safeguard panelboards and loadcenters from overcurrent and short-circuit events. Its compact design maximizes usable space in dense electrical panels, while the thermal-magnetic trip unit delivers stable, repeatable protection across varying loads and ambient conditions.

Designed for seamless compatibility, this breaker is a natural fit for Eaton OEM loadcenters and panelboards, offering straightforward replacement and reliable coordination with your upstream protection scheme. Ideal for residential-adjacent commercial spaces and light industrial applications, the FAZ-D40/3N provides robust protection without sacrificing panel density.

Key benefits that matter in the real world

• Space-efficient molded case design helps you fit protection where panel real estate is at a premium, enabling cleaner wiring and easier future upgrades.
• Thermal-magnetic trip unit delivers stable trip performance—thermal protection handles sustained overloads, while magnetic protection responds rapidly to short circuits.
• 40A at 480V, 3-pole configuration is tailored for 3-phase systems, safeguarding feeders and branch circuits feeding motors, transformers, and other 480V equipment.
• OEM-compatible installation works as a direct-fit replacement in matching Eaton panelboards and loadcenters, reducing downtime and labor during upgrades or maintenance.
• Versatile for multiple environments suitable for residential-adjacent commercial spaces and light industrial installations where reliable 3-phase protection is essential.

How it protects your system

When current stays within the rated 40A, the breaker remains in a closed, conductive state. If a sustained overload occurs, the thermal element slowly responds to heat buildup. In the event of a sudden fault current, the magnetic element trips quickly to interrupt the circuit, preventing damage to conductors, devices, and downstream equipment. This dual-action protection is particularly valuable in panels that feed motors, compressors, or power distribution blocks in busy, multi-circuit environments.

Technical snapshot

• Manufacturer: Eaton
• Part Number: FAZ-D40/3N
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 480V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

• Protection for 3-phase feeders supplying motors, HVAC equipment, or transformers in commercial and light industrial environments
• Replacement in existing Eaton OEM panelboards and loadcenters to maintain consistent protection class and trip characteristics
• Space-conscious panel upgrades where maintaining 480V 3-phase protection is required without expanding enclosure size

With the Eaton FAZ-D40/3N, you get dependable, industry-grade protection tailored to 480V three-phase systems, backed by a compact footprint and seamless compatibility with Eaton panel products. If you’re stocking a 3P 480V panel or upgrading a distribution board, this 40A, 3-pole breaker is a precise, reliable choice that helps you protect critical equipment while keeping your panel layout tidy and efficient.