Square D FA340401021 40A 3P 480V Circuit Breaker | AmpState

Meet the Square D FA340401021—a purpose-built circuit breaker engineered to protect your electrical distribution with precise, dependable performance. Rated at 40 A and featuring 3 poles for 480 V circuits, this unit is ideal for three-phase panelboards and load centers in commercial and light industrial environments.

Why this matters for your project: using the exact original part number FA340401021 helps keep your bill of materials (BOM) aligned, reduces cross-reference confusion, and simplifies maintenance or retrofit workflows. Having the right replacement part on hand means faster swaps and fewer surprises during downtime.

Key specifications

• Amperage: 40 A
• Poles: 3
• Voltage rating: 480 V
• Part number: FA340401021
• Manufacturer: Square D (Schneider Electric)
• Application: Circuit protection for panelboards, load centers, and electrical distribution
• Availability: AmpState

What sets it apart

This FA340401021 isn’t a generic alternative. It’s the exact counterpart designed to drop into Square D equipment, preserving original fit, form, and protection characteristics. Keeping a spare with the same part number ensures a rapid, screwdriver-to-swap replacement that minimizes system downtime and maintains documented configuration integrity.

Ideal use cases

• Replacing a failed breaker in panelboards or load centers that run 480V three-phase services
• Stocking a reliable spare for ongoing electrical distribution projects
• Maintaining BOM integrity during equipment upgrades or expansions

Need help confirming compatibility? AmpState is ready to assist. Share the part number and your panel details, and we’ll verify fit to ensure a seamless replacement.

Available from AmpState, the Square D FA340401021 provides dependable protection for your electrical system with a precise, original-part fit you can trust.