Eaton | FD4040 | Circuit Breaker | 40A | 4-Pole

The Eaton FD4040 is a rugged 40A, 4-pole circuit breaker designed for maintenance, retrofit, and replacement projects where exact specifications matter. Built to align with existing electrical systems, this unit helps you protect multi-conductor circuits with dependable opening and closing performance—providing peace of mind in both commercial and light industrial settings.

• Amperage: 40A
• Poles: 4-Pole
• Part number: FD4040
• Brand: Eaton

Why the FD4040 stands out

4-pole design means all conductors in a four-wire or three-phase with neutral setup are simultaneously isolated, enhancing safety and helping meet specific installation requirements. The FD4040 is a purpose-built replacement option when a like-for-like form factor and rating are required, ensuring you don’t have to modify panels or wiring to achieve a proper fit.

Ideal use cases

• Maintenance swaps where the existing unit matches the FD4040’s 40A, 4-pole configuration
• Retrofits to upgrade panel protection without overhauling wiring or panels
• Replacement for aging or failed breakers that require exact part-number compatibility

Compatibility and installation tips

Before ordering, confirm fit and ratings to ensure seamless replacement. The part number FD4040 is your best reference for compatibility, so verify this exact model matches the specifications listed for your panel or distribution system. When installing:

• Power down and lockout/tagout as required; follow the panel’s installation instructions
• Double-check that the panel supports a 40A, 4-pole breaker in the intended circuit
• Ensure wiring and conductor sizing meet project requirements and local codes

Who benefits most

• Electrical contractors performing panel upgrades or replacements
• Facility managers maintaining reliable, code-compliant electrical protection
• Maintenance technicians seeking a precise, like-for-like replacement for FD4040-equipped systems

For reliable protection that aligns with your existing specifications, choose the Eaton FD4040 40A 4-pole circuit breaker. Its exact part-number fit, robust 4-pole design, and clear emphasis on matching ratings make it a practical, straightforward solution for modernizing or maintaining protected electrical circuits.