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Square D FA14090B Molded Case Circuit Breaker
- 90A
- 1 Pole
- I-Line
Square D
FA14090B
Molded Case Circuit Breaker
Brand
Square D
SKU
FA14090B
Quantity
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Square D FA14090B - 90A 1 Pole Molded Case Circuit Breaker
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Description
Part of the legacy F-Frame series, this 90A breaker delivers reliable overcurrent protection for commercial facilities. The unit mounts into standard Square D I-Line panelboards. Facility managers will find it serves as an exact match before upgrading to the newer PowerPacT BDA140903 series. Featuring a 25kAIC rating at 120VAC, it includes the signature Visi-Trip indicator. The factory lugs accommodate 14-1/0 AWG copper wire.Specifications
| Brand | Square D |
|---|---|
| Part Number | FA14090B |
| Series | FA |
| Amperage | 90A |
| Poles | 1 |
| Mounting Style | I-Line |
| Voltage | 120VAC, 277VAC, 125VDC |
| Phase | 1 |
| AIC Rating | 25kA @ 120VAC, 18kA @ 277VAC, 10kA @ 125VDC |
| Frame Type | FA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Phase Connection B |
Product FAQs
5 answersCan I install the FA14090B in a standard Square D QO or NQ load center?
No. The FA14090B features an I-Line plug-on jaw and is exclusively compatible with Square D I-Line panelboards and switchboards. It will not fit QO, NQ, or NF series panels.
What does the "B" suffix mean in the FA14090B part number?
The "B" indicates the breaker is factory-configured for a B-phase connection on the I-Line bus. When mounted in the panelboard, the line-side jaw will specifically engage the B-phase bus bar.
How does the FA14090B connect to the panelboard and the load?
It utilizes a shrouded I-Line plug-on jaw on the line side that snaps directly onto the panelboard bus, and a standard mechanical lug on the load side for terminating the load wire.
What is the modern replacement for the legacy FA14090B circuit breaker?
The FA series is a legacy F-Frame breaker. Square D now recommends the PowerPacT B-Frame series (specifically BDA models) as the direct modern replacement for 1-pole I-Line applications.
Does the FA14090B include a visual trip indicator?
Yes, this breaker features Square D's signature Visi-Trip indicator. When the breaker trips due to an overcurrent or short circuit, a highly visible red indicator appears to help quickly identify the faulted circuit.
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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.