Free Shipping Over $99
Square D FA36100-1021 Molded Case Circuit Breaker
- 100A
- 3 Pole
- I-Line
Square D
FA36100-1021
Molded Case Circuit Breaker
Brand
Square D
SKU
FA36100-1021
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D FA36100-1021 - 100A 3 Pole Molded Case Circuit Breaker
New
Quantity
Similar Items
60A 3 Pole Molded Case Circuit Breaker
50A 3 Pole Molded Case Circuit Breaker
20A 3 Pole Molded Case Circuit Breaker
Description
Built for remote control applications, the FA36100-1021 is a 100A, 3-pole molded case circuit breaker featuring a factory-installed 120/240VAC shunt trip. This allows users to safely open the circuit from a remote location. This F-frame MCCB installs into Square D I-Line panelboards and switchboards. It is ideal for industrial environments requiring emergency shutdown capabilities. Delivering 25kAIC at 240V, this HACR-rated breaker provides reliable thermal-magnetic protection.Specifications
| Brand | Square D |
|---|---|
| Part Number | FA36100-1021 |
| Series | FA |
| Amperage | 100A |
| 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, Square D I-Line Switchboards |
| Wire Gauge | 14-1/0 AWG (Cu), 12-1/0 AWG (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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersWhat does the -1021 suffix indicate on the FA36100-1021?
The -1021 suffix designates a factory-installed 120/240VAC shunt trip. This accessory allows the breaker to be tripped remotely, which is commonly required for emergency shutdown systems or remote control applications.
Which panelboards are compatible with the FA36100-1021?
This breaker features an I-Line style plug-in connection on the line side. It is specifically designed to mount in Square D I-Line panelboards and switchboards. It will not fit in standard QO load centers or NQ and NF series panels.
What are the acceptable wire gauges for the load side lugs?
The standard load lugs on this 100A breaker accept 14 to 1/0 AWG copper conductors or 12 to 1/0 AWG aluminum conductors. The line side utilizes an I-Line plug-on connection, so no line side wiring is required.
Can the FA36100-1021 be used in direct current systems?
Yes, this thermal-magnetic breaker is rated for DC applications up to 250VDC. It provides a 10 kA interrupting rating at 250VDC, making it suitable for specific industrial control or battery system circuits.
Are the trip settings adjustable on this FA frame breaker?
No, the FA36100-1021 features a fixed thermal-magnetic trip unit. Both the long-time overload and instantaneous short circuit trip points are factory set and cannot be adjusted in the field.
What is the modern replacement for legacy FA series breakers?
The FA frame is part of the legacy Square D F-Frame series. For new builds or complete panel upgrades, Square D has transitioned to the PowerPact B-Frame series. However, FA breakers remain available for direct replacements in existing I-Line panels.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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.
Search
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.