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Square D FA14040C Molded Case Circuit Breaker
- 40A
- 1 Pole
- I-Line
Square D
FA14040C
Molded Case Circuit Breaker
Brand
Square D
SKU
FA14040C
Quantity
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Square D FA14040C - 40A 1 Pole Molded Case Circuit Breaker
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Description
Built for industrial environments, the Square D FA14040C provides reliable overcurrent protection with a visual trip indicator. This 1-pole, 40A breaker belongs to the trusted F-Frame series. Designed for quick installation, it mounts into Square D I-Line panelboards using a Phase C connection. For modern upgrades, this unit crosses over to the PowerPacT B-Frame BDA140405. It delivers 18 kAIC interrupting capacity at 277VAC, featuring standard long-time and instantaneous (LI) protection.Specifications
| Brand | Square D |
|---|---|
| Series | FA |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | I-Line |
| Voltage | 120VAC, 277VAC, 125VDC |
| Phase | 1 |
| AIC Rating | 25kA @ 120VAC, 18kA @ 277VAC, 10kA @ 125VDC |
| Frame Type | FA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Phase Connection C |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Phase Connection C |
Product FAQs
7 answersWhat panelboards is the FA14040C compatible with?
This breaker is designed exclusively for use in Square D I-Line panelboards and switchboards. It features a plug-on line connection and a mechanical lug load connection.
Is the FA frame still a current product line?
The FA frame is a legacy F-Frame series. While still widely used and supported in existing I-Line panelboards, Square D has introduced the PowerPacT B-Frame as the modern crossover replacement for new installations.
What does the C suffix in FA14040C indicate?
The C suffix indicates that this 1-pole breaker is factory-configured to connect specifically to the C-phase bus of an I-Line panelboard.
How does the I-Line mounting system work on this breaker?
The FA14040C uses a plug-on blow-on line connection that grips the panelboard bus tighter during high-fault currents. The load side utilizes standard mechanical lugs.
What is the difference between Square D FA and FH breakers?
FA breakers provide standard interrupting ratings, which is 18kAIC at 277VAC for this model. FH breakers are the high-interrupting equivalents, designed for systems with higher available fault currents.
What is the modern replacement for the FA14040C?
The direct modern crossover for this legacy F-Frame breaker is the Square D PowerPacT B-Frame series, specifically catalog number BDA140405 for a 40A, 1-pole, C-phase I-Line breaker.
Can the trip settings on the FA14040C be adjusted in the field?
No. This breaker features a fixed thermal magnetic trip unit with factory-calibrated long-time and instantaneous protection. The settings cannot be modified in the field.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 71 reviews.
Reviews Summary
Generated by AI from 68 most recent customer reviews
Last updated 8/15/26
Customers say this circuit breaker matches its description, fits perfectly, and works as expected. Many reviews highlight fast shipping and quick delivery times, with several noting orders arrived within days. Users appreciate the product condition, describing refurbished units as appearing new without wear or marks. Common feedback addresses competitive pricing compared to local suppliers and the overall value proposition. Customers report straightforward ordering processes and reliable service, with repeat purchasers noting consistent positive experiences. The breaker installed easily and functioned properly in various applications.
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Rating
71 reviews
- RLRichard L.Verified BuyerReviewingSquare D FA34090 - 90A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/30/26Mill Superintendant
Works great!
We will definitely use SuperBreakers again.
Thank you!
Richard
- CPCasey P.Verified BuyerReviewingSquare D FA34030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/14/26Great company
Ordered on a Saturday evening, paid for two day shipping and it arrived on time and in perfect condition. Would 100 percent be using this company going forward, beat out pricing and shipping times for all my local supply houses. Plus the staff were great to deal with.
- AHAnn H.Verified BuyerReviewingSquare D FA36100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/22/26Professional Service
So far, so good! The circuit breaker was installed along with a new compressor for our church AC, and everything is now working well.
The company has been professional, dependable, and reputable throughout the process. I had a question after the installation, and it was answered immediately. I also appreciated that they followed up and asked for feedback to make sure the new part was working properly and that we were satisfied with the service.
It’s refreshing to deal with a company that not only has quality products but also cares about its customers after the job is completed. I would definitely recommend them!
- RErene e.Verified BuyerReviewingSquare D FA34070 - 70A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/14/26breaker
breaker was just as discribed
- BEBallentine E.Verified BuyerReviewingSquare D FA24060AC - 60A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/15/26Great
Accurate and on time.