Square D FA14040C - 40 A, 1-Pole Plug-In Circuit Breaker | AmpState

The Square D FA14040C is a 40A, 1-pole plug-in molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Its fast plug-in connection makes installation and future replacements a straightforward, downtime‑saving process for busy electrical spaces.

Why this 40A 1-Pole Plug-In Breaker stands out

Designed for real-world applications, this breaker pairs a robust thermal-magnetic trip unit with a plug-in format that simplifies upgrades and service work in the field. It’s not just a component—it’s a reliable safety and performance upgrade for your electrical system.

• Fast plug-in connection enables quick installation and simple future replacements, minimizing panel downtime during upgrades or maintenance.
• Thermal-magnetic trip unit delivers stable, repeatable protection against overcurrent and short circuits, reducing nuisance trips while preserving circuit integrity.
• OEM-compatible design ensures seamless compatibility with matching load centers and panelboards for a reliable, matched fit.
• Versatile for diverse environments suitable for residential, commercial, and light industrial applications, providing flexible protection across projects.

Technical snapshot

• Manufacturer: Square D
• Part Number: FA14040C
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40A
• Number of poles: 1
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

This 40A, 1-pole plug-in breaker is well-suited for protecting individual branch circuits within panelboards and load centers in:

• Residential service upgrades where additional circuits are added or existing panels are upgraded for safety.
• Commercial office spaces needing reliable protection for lighting, outlets, and small equipment circuits.
• Light industrial installations requiring durable, plug-in protection that can be replaced quickly during routine maintenance.

Practical guidance for installation and compatibility

To maximize performance, pair the FA14040C with compatible OEM load centers and panelboards designed for plug-in molded case breakers. When performing installations or replacements, ensure the panel is de-energized and the existing bus connections are clean and secure to maintain a solid plug-in connection and accurate trip response.

In environments where quick service and reliable protection matter, this 40A 1-pole plug-in breaker provides a precise balance of fast installation, dependable protection, and broad compatibility—helping you keep panels operating safely and efficiently.

Upgrade or replace with confidence: the Square D FA14040C delivers the protection you need, where you need it, with the practical ease that professionals rely on for everyday electrical work.