Square D FA14040 A - 40 A, 1-Pole Plug-In Circuit Breaker | AmpState

The Square D FA14040A is a 40A, 1-pole plug-in molded case circuit breaker designed to safeguard your electrical system with precise, reliable protection. Built for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers, this unit is ready for fast, straightforward installations and quick replacements when you need them most.

Why choose the FA14040A for your electrical panel?

• Fast plug-in connection enables rapid installation and streamlined service calls, reducing downtime when you’re upgrading or replacing breakers.
• Thermal-magnetic trip unit delivers stable, repeatable protection across varying loads and ambient conditions, helping to prevent nuisance trips while still reacting quickly to faults.
• 1-pole, 40A design is ideal for single-phase branch circuits that demand robust protection without unnecessary complexity.
• OEM-compatible compatibility with matching Square D load centers and panelboards ensures a proper fit and predictable performance.
• Versatile across settings suitable for residential, commercial, and light industrial environments, from home upgrades to small office panels and shop equipment.

What problems does it solve?

By providing precise overcurrent and short-circuit protection, the FA14040A helps prevent wiring damage, fire hazards, and equipment downtime. Its thermal-magnetic trip mechanism balances fast response to short circuits with stable protection for normal operation, reducing the risk of unnecessary outages while maintaining safety.

Key specifications at a glance

• Brand: Square D
• Part Number: FA14040A
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage: 40 A
• Poles: 1
• Mounting style: Plug-in
• Typical applications: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Ideal use scenarios

• Replacing a failed or aged 40A single-pole breaker in residential panels.
• Adding or upgrading a 40A branch circuit in a small commercial panelboard.
• Retrofits for light industrial setups where quick plug-in installation minimizes downtime.
• Custom electrical projects requiring reliable, OEM-compatible protection in Square D environments.

Designed with real-world electrical needs in mind, the FA14040A offers a practical blend of speed, reliability, and compatibility. Whether you’re performing a routine panel upgrade or wiring a new circuit from the breaker panel, this plug-in MCCB from Square D delivers predictable protection, straightforward installation, and long-term service continuity.