Eaton FDB3040L - 40 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton FDB3040L is a 40A, 600V, 3-pole molded case circuit breaker built for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Designed to fit seamlessly with matching OEM panels, this unit delivers reliable protection across residential, commercial, and light industrial environments.

Why the FDB3040L stands out

• Compact molded case design optimizes panel space without sacrificing performance, making it ideal for dense load centers and retrofit installations.
• Thermal-magnetic trip unit provides stable, repeatable protection by responding to both overloads and short circuits, reducing nuisance trips and ensuring consistent performance over time.
• 3-pole configuration ensures simultaneous disconnection across all three legs in three-phase systems, enhancing safety and coordination in multi-wire circuits.
• 600V rating broadens applicability beyond residential panels to commercial and light industrial panels where higher voltage distribution is common.
• 40A current rating protects branch circuits and connected equipment without unnecessary interruption, supporting typical lighting, receptacle, and equipment feeders.
• OEM panel compatibility designed to align with matching Eaton panelboards and OEM load centers for a straightforward, reliable installation.
• Trusted performance from Eaton’s molded case breaker line, delivering durable construction and long-term protection for critical electrical infrastructure.

Real-world use cases

• Upgrading a residential multi‑wire distribution panel where a dedicated 40A branch circuit feeds a high-draw appliance or subpanel, while maintaining coordinated trip across all phases.
• Installing in small commercial offices or light retail spaces with three-phase distribution, where reliable overcurrent and short-circuit protection is essential for panels, feeders, and equipment circuits.
• Retrofits in industrial enclosures where higher voltage distribution is present, ensuring safe de-energization of all lines during a fault.

Technical specifics

• Manufacturer: Eaton
• Part Number: FDB3040L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Choosing the right breaker for your panel

When you need dependable protection that won’t disrupt critical loads, the Eaton FDB3040L provides precise trip performance and panel compatibility. It’s a practical choice for installers prioritizing panel density, reliable three‑phase protection, and compatibility with Eaton’s family of load centers. With its compact footprint and robust thermal-magnetic protection, it helps you design safer, more resilient electrical systems across homes, workplaces, and light industrial settings.