Square D FA340401021 Molded Case Circuit Breaker
- 40A
- 3 Pole
- I-Line
Square D
FA340401021
Molded Case Circuit Breaker
Brand
Square D
SKU
FA340401021
Quantity
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Square D FA340401021 - 40A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial and industrial use, this 40A, 3-pole molded case circuit breaker provides robust thermal-magnetic protection. It features a factory-installed 120VAC shunt trip, allowing for remote circuit disconnects during emergencies. Designed for Square D I-Line panelboards, the plug-on phase connections ensure rapid installation. It serves as a replacement for older F-Frame setups, with the modern HDA36040SA acting as its equivalent. Rated 18kAIC at 480V, it includes Visi-Trip.Specifications
| Brand | Square D |
|---|---|
| Series | FA |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480Y/277VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| 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 | Auxiliary Switch, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Shunt Trip |
| 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 |
Product FAQs
8 answersWhat panelboards are compatible with the FA340401021?
This breaker is designed specifically for Square D I-Line panelboards and switchboards. It uses an I-Line style plug-on connection to attach directly to the busbar.
What does the 1021 suffix indicate on the FA340401021?
The 1021 suffix designates a factory-installed 120/240VAC shunt trip mechanism. This allows the breaker to be tripped remotely for emergency shutdowns or automated control.
What is the modern replacement for the legacy FA340401021?
The legacy F-frame FA340401021 is superseded by the Square D PowerPact series. Direct modern equivalents include the H-frame HDA36040SA or the B-frame BDA34040Y, though the B-frame requires a separate LV426843 shunt trip accessory.
What wire sizes are accepted by the terminals on this breaker?
The load-side lugs accept 14 AWG to 1/0 AWG copper or aluminum conductors.
Is the FA340401021 rated for DC voltage applications?
Yes, in addition to its AC ratings, this thermal-magnetic breaker is rated for 250VDC systems with an interrupting capacity of 10kAIC.
How can I visually identify if the FA340401021 has tripped?
This breaker features a Visi-Trip indicator, which provides a highly visible red flag in the window when the breaker trips, allowing for rapid fault identification in the panel.
Does the FA340401021 require bolt-on hardware for installation?
No, it utilizes an I-Line plug-in mounting system for the line side, which snaps directly onto the panelboard bus. Only the load side requires standard lug terminations.
Are the trip settings adjustable on the FA340401021?
No, this breaker features fixed thermal and fixed magnetic trip elements for both long-time and instantaneous protection.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 70 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
70 reviews
- 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.
- EBEdward B.Verified BuyerReviewingSquare D FA32100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/1/26As good as new
The Square D FA32100 circuit breaker (refurbished) was as good as a new breaker, without exception. There was no wear and tear or any marks at all. It was basically new. It is an excellent choice and a great product without having to pay the cost of a new breaker.