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Square D FA36040-1021 Molded Case Circuit Breaker
- 40A
- 3 Pole
- I-Line
Square D
FA36040-1021
Molded Case Circuit Breaker
Brand
Square D
SKU
FA36040-1021
Quantity
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Square D FA36040-1021 - 40A 3 Pole Molded Case Circuit Breaker
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Description
Built for industrial control applications, this 40-amp thermal-magnetic breaker incorporates a factory-installed 120VAC shunt trip mechanism. This added functionality permits remote tripping of the circuit via an external voltage signal, which is essential for emergency shutdown systems and automated facility management. The device mounts into standard Square D I-Line panelboards using a secure plug-on jaw design.Specifications
| Brand | Square D |
|---|---|
| Part Number | FA36040-1021 |
| 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 | Auxiliary Switch, Alarm Switch, Undervoltage Release, Shunt Trip, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Lugs |
| 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
8 answersWhat does the -1021 suffix indicate on the FA36040-1021 circuit breaker?
The -1021 suffix designates that this breaker includes a factory-installed 120VAC shunt trip mechanism. This allows the breaker to be tripped remotely via an external voltage signal, which is commonly used for emergency shutdown systems and automated facility management.
What type of panelboards are compatible with the FA36040-1021 breaker?
This breaker features an I-Line style plug-in connection and is designed exclusively for use in Square D I-Line panelboards and switchboards. It will not fit in standard load centers or NQ and NF series panels.
What wire sizes are accepted by the lugs on the FA36040-1021?
The factory-installed lugs accept copper or aluminum conductors ranging from 14 AWG to 1/0 AWG. Ensure proper torque specifications are followed during installation to maintain a secure connection.
Can the FA36040-1021 be used in DC applications?
Yes, this thermal-magnetic breaker is rated for use in DC circuits up to 250VDC, providing an interrupting capacity of 10kA at that voltage. This makes it suitable for specific industrial control and battery backup applications.
Is the FA36040-1021 a direct replacement for older 40A FA-frame breakers?
Yes, it serves as a direct drop-in replacement for older 40-amp, 3-pole FA-frame I-Line breakers. However, because of the -1021 suffix, it should specifically be used when your application requires the integrated 120VAC shunt trip feature.
Does the FA36040-1021 require mounting hardware to install in an I-Line panel?
No additional mounting hardware is required. The I-Line plug-on jaw design allows the breaker to snap directly onto the panelboard bus assembly, securing it in place and simplifying the installation process.
How can I verify if the FA36040-1021 has tripped?
Like most Square D molded case circuit breakers, the operating handle will move to a center tripped position between ON and OFF when a fault is detected. The handle must be moved fully to the OFF position before it can be reset and turned back ON.
Is the FA series considered a legacy product?
Yes, the FA series is a legacy F-Frame molded case circuit breaker. While it is an older design, it remains an exact fit for existing I-Line panelboards, allowing you to replace faulty units without upgrading the entire panel infrastructure.
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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.