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Square D FA34015-1021 Molded Case Circuit Breaker
- 15A
- 3 Pole
- I-Line
Square D
FA34015-1021
Molded Case Circuit Breaker
Brand
Square D
SKU
FA34015-1021
Quantity
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Square D FA34015-1021 - 15A 3 Pole Molded Case Circuit Breaker
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Description
Designed with integrated remote tripping capabilities, this 15A molded case circuit breaker features a factory-installed shunt trip mechanism. It connects into Square D I-Line panelboards and switchboards, utilizing the standard plug-on phase jaw design. Capable of 18kAIC at 480VAC, the thermal-magnetic unit provides reliable long-time and instantaneous protection. When upgrading, use the HDA36015 combined with an S29386 shunt trip accessory.Specifications
| Brand | Square D |
|---|---|
| Part Number | FA34015-1021 |
| Series | FA |
| Amperage | 15A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| Frame Type | FA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 14-4 AWG (Cu/Al) |
| Max Wire | 4 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, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, UL 489, Federal Specification W-C-375B/GEN |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersWhat does the -1021 suffix indicate on the FA34015-1021?
The -1021 suffix designates a factory-installed 120/240VAC shunt trip mechanism. This allows the breaker to be opened remotely for emergency shutdowns or automated control systems.
Will the FA34015-1021 fit in a standard Square D NQ or NF panelboard?
No. This breaker features an I-Line plug-on connection and is exclusively compatible with Square D I-Line panelboards and switchboards. It will not fit in NQ, NF, or QO load centers.
What is the modern replacement for the legacy FA34015-1021 breaker?
The FA frame is a legacy product. For modern facility upgrades, Square D recommends using the PowerPact H-frame series. Specifically, the HDA36015 breaker combined with an S29386 shunt trip accessory can serve as a functional replacement.
How does the FA34015-1021 mount into the panelboard?
This breaker utilizes an I-Line style plug-on connection. It snaps directly onto the panelboard bus assembly, allowing for quick installation without the need for individual wire connections to the bus.
Are the trip settings adjustable on the FA34015-1021?
No. This breaker features a thermal magnetic trip unit with fixed thermal (long time) and fixed magnetic (instantaneous) settings. They cannot be adjusted in the field.
How can I manually test the mechanical operation of the FA34015-1021?
You can use the push-to-trip button located on the face of the breaker. Pressing this button manually trips the breaker, allowing you to verify the mechanical operation of the tripping mechanism without exposing personnel to live electrical parts.
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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.