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Square D FAB36020 Circuit Breaker
- 20
- 3 Pole
- Bolt-On
Square D
FAB36020
Circuit Breaker
Brand
Square D
SKU
FAB36020
Quantity
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Square D FAB36020 3 Pole Circuit Breaker
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Square D FAB36020 3 Pole Circuit Breaker
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| Brand | Square D |
|---|---|
| Part Number | FAB36020 |
| Series | FA |
| Amperage | 20 A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | F |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 14-4 AWG |
| 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 | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Quantity
Square D FAB36020 3 Pole Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Series | FA |
| Amperage | 20 A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | F |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 14-4 AWG |
| 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 | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
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Description
Square D FAB36020 3 Pole Circuit Breaker
The Square D FAB36020 is a 3 Pole thermal magnetic molded case circuit breaker with a current rating of 20 Amps and a voltage rating of 600VAC. It has an interrupting rating of 25kAIC at 480V. The FAB36020 has an I-Line style bolt-on connection type and includes long time and instantaneous trip functions.
Specifications
| Brand | Square D |
|---|---|
| Series | FA |
| Amperage | 20 A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | F |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 14-4 AWG |
| 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 | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersIs the Square D FA series obsolete, and what is the modern replacement?
Yes, the legacy F-Frame (FA series) breakers are obsolete for new installations. The modern replacement is the Square D PowerPact H-Frame series, which is designed to fit into the same legacy I-Line panelboards.
What replacement lugs are compatible with the FAB36020?
This breaker accepts AL50FA mechanical lugs on the load side, which are designed to accommodate 14-4 AWG copper or aluminum wire.
Is the FAB36020 HACR rated?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires this specific overcurrent protection rating.
How does the I-Line connection work on the FAB36020?
The I-Line mounting system features a blow-on, plug-on design where the breaker jaws grip the panelboard bus bar. A captive mounting screw then bolts the breaker securely to the backpan.
Can I use this breaker in a standard QO or Homeline load center?
No. The FAB36020 features an I-Line style bolt-on connection and is strictly compatible with industrial I-Line panelboards and switchboards. It will not fit in residential QO or Homeline load centers.
What does the "B" in the FAB36020 catalog number signify?
In the FA series catalog numbering, the "B" indicates that the breaker is configured for an I-Line panelboard connection. This means it has a plug-on jaw on the line side and a standard lug on the load side.
What is the difference between the FAB36020 and the FHB36020?
The primary difference is the interrupting capacity. The FA series is standard interrupting, while the FH series provides a higher interrupting rating for systems with greater available fault current.
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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.