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Square D FA36050-1021 Molded Case Circuit Breaker
- 50A
- 3 Pole
- I-Line
Square D
FA36050-1021
Molded Case Circuit Breaker
Brand
Square D
SKU
FA36050-1021
Quantity
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Square D FA36050-1021 - 50A 3 Pole Molded Case Circuit Breaker
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Description
Integrating a factory-installed 120VAC shunt trip mechanism, this 50A F-frame breaker enables remote tripping capabilities for emergency shutdowns or automated control schemes. It securely installs into Square D I-Line panelboards, providing standard thermal-magnetic protection for commercial distribution networks. Rated at 18kAIC at 480V, this specialized unit includes the signature Visi-Trip feature and is superseded by the PowerPact HDA36050SA for modern panelboard applications.Specifications
| Brand | Square D |
|---|---|
| Part Number | FA36050-1021 |
| Series | FA |
| Amperage | 50A |
| 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 | Undervoltage Release, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included, 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 |
Product FAQs
9 answersWhat type of panelboards is the FA36050-1021 designed for?
This breaker is designed for use in Square D I-Line panelboards and switchboards. It features an I-Line style plug-in connection on the line side and mechanical lugs on the load side.
Can the FA36050-1021 be used in a standard QO load center?
No, this is an F-frame molded case circuit breaker with an I-Line style plug-in connection. It is exclusively designed for commercial and industrial I-Line panelboards and switchboards, not residential QO load centers.
What does the -1021 suffix mean on this Square D breaker?
The -1021 suffix indicates that the breaker includes a factory-installed 120/240V AC shunt trip mechanism. This allows the circuit breaker to be tripped remotely via an external control signal.
How is the shunt trip wired on the FA36050-1021?
The factory-installed 120/240V AC shunt trip mechanism features external pigtail leads that exit the breaker housing. These leads must be connected to your external control circuit to enable remote tripping capabilities.
How does the FA36050-1021 mount into the panel?
It utilizes an I-Line style plug-in connection for the line side, which snaps directly into the busbar of an I-Line panelboard. The load side uses standard mechanical lugs for wire connections.
Can the trip settings on the FA36050-1021 be adjusted in the field?
No, this breaker features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous trip points are factory-set and cannot be adjusted by the user.
What type of wire connections does the FA36050-1021 use on the load side?
The load side of this breaker is equipped with mechanical lugs that accept either copper or aluminum wire, accommodating sizes from 14 AWG up to 1/0 AWG.
Is the FA36050-1021 suitable for DC applications?
Yes, this thermal-magnetic breaker is rated for use in DC systems up to 250V DC, providing an interrupting capacity of 10kA for direct current applications.
What is the modern replacement for the legacy FA36050-1021 breaker?
The FA series is a legacy F-frame breaker. For modern Square D I-Line panelboard applications, it is typically superseded by the PowerPact H-frame series, specifically the HDA36050SA, which includes the required factory-installed shunt trip.
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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.