Square D FA360401021 Molded Case Circuit Breaker
- 40A
- 3 Pole
- I-Line
Square D
FA360401021
Molded Case Circuit Breaker
Brand
Square D
SKU
FA360401021
Quantity
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Square D FA360401021 - 40A 3 Pole Molded Case Circuit Breaker
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Description
Designed for automated control systems, this three-pole F-frame breaker incorporates a 120V shunt trip mechanism for remote power interruption. The device mounts into Square D I-Line panelboards, providing thermal-magnetic LI protection for industrial loads. Delivering 18 kAIC interrupting capacity at 480VAC, it ensures robust fault clearing. For modernizations, the PowerPact HDA36040SA serves as the current-generation replacement for this specific configuration.Specifications
| Brand | Square D |
|---|---|
| Series | FA |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480Y/277VAC, 18kA @ 480VAC, 14kA @ 600Y/347VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | FA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Switchboards |
| 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 | Undervoltage Release, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, HACR Rated, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
6 answersWhat does the 1021 suffix indicate on the FA360401021 circuit breaker?
The 1021 suffix means this breaker includes a factory-installed 120/240VAC shunt trip mechanism, which allows for remote tripping of the circuit breaker.
What is the current-generation replacement for the FA360401021 breaker?
The Square D PowerPact HDA36040SA is the modern equivalent for this specific configuration, providing the same 40A rating, I-Line mounting, and 120VAC shunt trip functionality.
Which panelboards are compatible with the FA360401021 breaker?
This breaker is designed for use in Square D I-Line panelboards and switchboards. It utilizes an I-Line style plug-in connection for line-side mounting.
What wire sizes and materials are accepted by the load side lugs on this breaker?
The load side lugs accept 14 AWG to 1/0 AWG wire and are rated for both copper (Cu) and aluminum (Al) conductors.
Are the thermal and magnetic trip settings adjustable on the FA360401021?
No, this breaker features a fixed thermal-magnetic trip unit. Both the Long-Time (thermal) and Instantaneous (magnetic) trip functions are non-adjustable.
Can the FA360401021 be used in DC applications?
Yes, this breaker is rated for up to 250VDC with an interrupting capacity of 10kAIC at that voltage.
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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.