Square D FA36040MT Molded Case Circuit Breaker
- 40A
- 3 Pole
- I-Line
Square D
FA36040MT
Molded Case Circuit Breaker
Brand
Square D
SKU
FA36040MT
Quantity
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Square D FA36040MT - 40A 3 Pole Molded Case Circuit Breaker
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Description
Part of the legacy FA series, the Square D FA36040MT is a 3-pole, 40A molded case circuit breaker built for robust power distribution. It features a specialized plug-on shroud on the OFF end, providing an extra layer of protection. The breaker mounts into standard Square D I-Line panelboards and switchboards. For modern upgrades, this unit is replaced by the HDA36040, though mounting orientation should be verified. Delivering 18 kAIC at 480VAC, it relies on fixed thermal-magnetic trip units.Specifications
| Brand | Square D |
|---|---|
| Part Number | FA36040MT |
| Series | FA |
| Amperage | 40A |
| 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 | F |
|---|---|
| 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 | Shunt Trip, Undervoltage Release, Alarm Switch, Auxiliary Switch |
|---|---|
| Accessories | Load Side Lugs Included, Plug-on Shroud on OFF End |
| Standards | CSA C22.2 No. 5, HACR Rated, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
6 answersWhat does the "MT" suffix indicate on this circuit breaker?
The "MT" suffix means the I-Line plug-on jaws are located on the OFF end of the breaker, rather than the standard ON end. This configuration is typically required for specific top-feed applications in I-Line panelboards.
Is the FA36040MT compatible with standard residential load centers?
No. This is an F-Frame molded case circuit breaker with an I-Line style plug-in connection. It is strictly designed for commercial and industrial Square D I-Line panelboards and switchboards, not residential QO or Homeline load centers.
Are the trip settings adjustable on the FA36040MT?
No, this breaker features a thermal magnetic trip unit with fixed long-time and fixed instantaneous trip functions. The settings cannot be adjusted in the field.
What is the modern replacement series for Square D FA breakers?
The Square D FA series is a legacy F-Frame breaker. Its modern equivalent is the PowerPact H-Frame series, specifically the HDA series. When replacing an "MT" suffix breaker, ensure the replacement also features the correct top-feed plug-on jaw configuration.
Is the FA36040MT suitable for HVAC applications?
Yes, this breaker is HACR rated, making it suitable for use with qualifying heating, ventilation, and air conditioning equipment.
Does this breaker require a separate mounting bracket for I-Line panels?
No, the FA36040MT features an I-Line style plug-in connection that mounts directly onto the bus of compatible Square D I-Line panelboards and switchboards without additional brackets.
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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.