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Square D FA34045-1021 Molded Case Circuit Breaker
- 45A
- 3 Pole
- I-Line
Square D
FA34045-1021
Molded Case Circuit Breaker
Brand
Square D
SKU
FA34045-1021
Quantity
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Square D FA34045-1021 - 45A 3 Pole Molded Case Circuit Breaker
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Description
Integrating remote disconnect capabilities, this 45A, 3-pole molded case circuit breaker features a factory-installed 120VAC shunt trip. This thermal-magnetic unit provides essential long-time and instantaneous protection for commercial facilities. Designed to fit Square D I-Line panelboards and switchboards, the plug-on configuration minimizes installation time. When upgrading, the PowerPact HDA36045 with an S29386 shunt trip serves as the modern equivalent. Rated 18kAIC at 480V.Specifications
| Brand | Square D |
|---|---|
| Part Number | FA34045-1021 |
| Series | FA |
| Amperage | 45A |
| 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 |
| Frame Type | FA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line 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 | Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| 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 |
Product FAQs
4 answersWhat does the -1021 suffix indicate on the FA34045-1021 part number?
The -1021 suffix means this circuit breaker includes a factory-installed 120-240V AC shunt trip. This accessory allows the breaker to be tripped remotely for emergency shutdown or control applications.
What is the modern replacement for the legacy FA34045-1021 breaker?
The modern equivalent for this legacy F-Frame breaker is the Square D PowerPact H-Frame series. You can upgrade using the HDA36045 breaker paired with an S29386 shunt trip accessory.
Can the FA34045-1021 be installed in a standard residential load center?
No. This is a commercial molded case circuit breaker with an I-Line plug-on connection. It is only compatible with Square D I-Line panelboards and switchboards, and will not fit standard QO or Homeline residential panels.
Does the FA34045-1021 include ground fault or arc fault protection?
No, this unit provides standard thermal magnetic protection against overloads and short circuits. It does not feature ground fault (GFCI) or arc fault (AFCI) capabilities.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 71 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
71 reviews
- RLRichard L.Verified BuyerReviewingSquare D FA34090 - 90A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/30/26Mill Superintendant
Works great!
We will definitely use SuperBreakers again.
Thank you!
Richard
- 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.