Square D FA320401021 Molded Case Circuit Breaker
- 40A
- 3 Pole
- I-Line
Square D
FA320401021
Molded Case Circuit Breaker
Brand
Square D
SKU
FA320401021
Quantity
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Square D FA320401021 - 40A 3 Pole Molded Case Circuit Breaker
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Description
Designed to support remote tripping requirements, this 40A thermal-magnetic MCCB includes a built-in shunt trip mechanism for enhanced facility control. The device mounts seamlessly into Square D I-Line panelboards, providing standard long-time and instantaneous protection. Facilities looking to modernize often replace this specific configuration with the BDA34040Y and an S29386 accessory. It maintains a 10kAIC rating at 240VAC and features the signature Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Series | FA |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 5kA @ 250VDC |
| Frame Type | FA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 14-1/0 AWG (Cu), 12-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG (Cu) / 12 AWG (Al) |
| 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, Padlock Attachment |
|---|---|
| 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, Visual Trip Indicator |
Product FAQs
5 answersHow does the FA320401021 install into a panelboard?
It features an I-Line plug-in mounting style, allowing it to snap directly onto the busbar of compatible Square D I-Line panelboards and switchboards without the need for bolt-on hardware.
What does the 1021 suffix indicate on this FA frame breaker?
The 1021 suffix signifies that the breaker comes equipped with a factory-installed 120VAC shunt trip accessory, which allows the breaker to be opened remotely via a control signal.
What are the wire gauge requirements for the lugs on this breaker?
The standard lugs accept 14 to 1/0 AWG copper conductors or 12 to 1/0 AWG aluminum conductors. Ensure proper torque specifications are followed during installation.
Can this breaker be used in DC electrical systems?
Yes, in addition to its AC ratings, this breaker is rated for use in direct current applications up to 250VDC, where it provides a 5kA interrupting capacity.
Can the thermal or magnetic trip points be adjusted in the field?
No, this breaker features a fixed thermal-magnetic trip unit. The long-time and instantaneous protection settings are factory-calibrated and cannot be modified.
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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.