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Square D FA34050-1121 Molded Case Circuit Breaker
- 50A
- 3 Pole
- I-Line
Square D
FA34050-1121
Molded Case Circuit Breaker
Brand
Square D
SKU
FA34050-1121
Quantity
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Square D FA34050-1121 - 50A 3 Pole Molded Case Circuit Breaker
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Description
Utilizing a robust F-frame construction, this 50-amp device provides overcurrent protection alongside a built-in 120VAC undervoltage release. Designed for Square D I-Line panelboards, the breaker utilizes a secure plug-on mounting system. It can be replaced by the newer BDA34050 model. Rated for 18kAIC at 480VAC, the assembly incorporates a visual trip indicator to minimize downtime during electrical fault events.Specifications
| Brand | Square D |
|---|---|
| Part Number | FA34050-1121-R |
| Series | FA |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480Y/277VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Undervoltage Release (120VAC) |
| 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, 80% Rated |
Product FAQs
6 answersWhat does the "-1121" suffix indicate on the FA34050-1121?
The "-1121" suffix designates a factory-installed 120V Under Voltage Release (UVR). This internal accessory automatically trips the breaker if the control voltage drops below a safe threshold, protecting sensitive equipment from brownouts or power loss.
What is the modern PowerPact replacement for the FA34050-1121?
For facility upgrades, the legacy F-Frame FA34050 crosses over to the modern Square D PowerPact B-Frame BDA34050. To replicate the functionality of the "-1121" suffix, you must also add a 120V Under Voltage Release accessory to the new PowerPact breaker.
Can field accessories be added to the FA34050-1121 after purchase?
No. On legacy Square D F-Frame circuit breakers, internal accessories like shunt trips, auxiliary switches, and under voltage releases are factory-installed and cannot be added or modified in the field.
How does the I-Line plug-on connection work during installation?
The I-Line mounting system features plug-on jaws that engage directly with the panelboard bus stack. This design eliminates the need for bolted line-side connections, allowing for faster installation and secure phase alignment in compatible Square D switchboards.
How does the Under Voltage Release (UVR) affect the breaker reset process?
The breaker cannot be turned ON or reset if the 120V control voltage to the UVR is absent or too low. You must restore the proper control voltage to the UVR terminals before the breaker mechanism will latch.
Is the FA34050-1121 compatible with standard QO or Homeline load centers?
No. This breaker utilizes an I-Line plug-on mounting style designed exclusively for industrial Square D I-Line panelboards and switchboards. It will not fit in residential QO or Homeline enclosures.
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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.