Square D FA340901037 Molded Case Circuit Breaker
- 90A
- 3 Pole
- I-Line
Square D
FA340901037
Molded Case Circuit Breaker
Brand
Square D
SKU
FA340901037
Quantity
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Square D FA340901037 - 90A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial applications, the Square D FA340901037 is a 3-pole, 90A molded case circuit breaker from the legacy F-Frame series. It provides reliable thermal-magnetic protection with long-time and instantaneous (LI) trip functions. This unit installs into Square D I-Line panelboards and switchboards. As a legacy component, it is commonly replaced by the HDA36090 equipped with an S29388 shunt trip. Rated 18kAIC at 480VAC, it includes a factory-installed 277-480VAC shunt trip.Specifications
| Brand | Square D |
|---|---|
| Part Number | FA340901037 |
| Series | FA |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| Frame Type | F |
|---|---|
| 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 |
| 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 (Factory Installed) |
| 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, Non-Interchangeable Trip |
Product FAQs
7 answersWhat panelboards are compatible with the FA340901037?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It utilizes an I-Line style plug-in connection for secure phase mounting directly to the bus.
What does the 1037 suffix indicate on this FA-frame breaker?
The 1037 suffix means the breaker is equipped with a factory-installed 380-480 VAC shunt trip. This accessory allows the breaker to be tripped remotely by an external control signal.
Is the FA340901037 a current model or a legacy breaker?
The FA-frame is a legacy series. For modern panel upgrades, it is typically replaced by Square D PowerPact B-Frame or H-Frame circuit breakers, such as the BDA34090, configured with a matching shunt trip accessory.
What wire sizes are accepted by the terminals on this 90A breaker?
The standard lugs accommodate 14 to 1/0 AWG copper wire or 12 to 1/0 AWG aluminum wire.
How does the integrated shunt trip improve system safety?
The 480V shunt trip allows personnel or automated systems to remotely open the circuit breaker during emergencies. This is commonly used for fire alarm integration, emergency stops, or equipment shutdown protocols.
Can the trip settings on the FA340901037 be adjusted in the field?
No, this breaker features a fixed thermal-magnetic trip unit. Both the long-time (overload) and instantaneous (short circuit) trip functions are factory set and cannot be modified.
Does the FA340901037 require a separate mounting hardware kit?
No, the I-Line plug-in design features integrated jaws that connect directly to the panelboard bus assembly. This eliminates the need for separate mounting hardware or cable connections on the line side.
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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.