Eaton FAZ-B40-3N - 40 A, 480 V, 3-Pole Circuit Breaker | AmpState

The Eaton FAZ-B40-3N is a robust 40 A, 480 V, 3-pole molded-case circuit breaker designed to protect your electrical distribution system from overcurrent and short-circuit events. Built for dependable performance in panelboards and load centers, it delivers consistent protection where three-phase power is in use.

• Compact molded-case design helps maximize panel space without compromising protection or reliability.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining overload protection with fast short-circuit interruption, reducing nuisance trips and safeguarding downstream equipment.
• OEM-compatible is designed to work with matching Eaton loadcenters and panelboards, ensuring seamless integration and reliable operation.
• Versatile applications suitable for residential, commercial, and light industrial environments where 3-phase 480 V distribution is required.

What makes it different

Unlike simple single-function breakers, the FAZ-B40-3N blends a compact MCCB form with a precise thermal-magnetic trip mechanism. This combination delivers predictable fault response across a range of fault currents, helping protect feeders, motors, and lighting circuits in busy panel deployments. Its three-pole configuration ensures balanced protection across all phases, essential for equipment and systems that rely on true three-phase power.

Ideal use cases

• New installations in commercial offices, retail spaces, and light industrial facilities that utilize 480 V three-phase power.
• Replacement or retrofit projects in Eaton panelboards and load centers to maintain consistent protection standards.
• Protecting branch circuits that feed motors, HVAC equipment, and distribution feeders where reliable trip performance matters.
• Systems where space efficiency in the panel is a priority due to compact design.

Technical specifications at a glance

Manufacturer: Eaton

Part number: FAZ-B40-3N

Type: Thermal-magnetic molded case circuit breaker (MCCB)

Amperage rating: 40 A

Voltage rating: 480 V

Poles: 3

Application: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Practical tips for installation and operation

• Verify that your panelboard or load center is compatible with the FAZ-B40-3N design to ensure proper fit and performance.
• Pair with other appropriately rated Eaton devices in the same series to maintain coordinated protection across the system.
• Plan for motor starting currents and short-circuit events by ensuring the 3-pole setup provides balanced distribution and protection across all phases.
• Schedule periodic inspection of connections and mounting to maintain reliable trip performance over time.