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Square D FAL34100-1021 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Unit Mount
Square D
FAL34100-1021
Molded Case Circuit Breaker
Brand
Square D
SKU
FAL34100-1021
Quantity
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Square D FAL34100-1021 - 100A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for industrial applications, the Square D FAL34100-1021 is a 3-pole, 100A molded case circuit breaker. It provides thermal-magnetic protection for systems up to 480VAC. This unit mount breaker installs into compatible Square D enclosures and motor control centers. As a legacy F-Frame component, it is replaced by the BDL36100SA for modern upgrades. Rated for 25kAIC at 240VAC, this model includes a factory-installed 120-240VAC shunt trip for remote tripping capabilities.Specifications
| Brand | Square D |
|---|---|
| Part Number | FAL34100-1021 |
| Series | FAL |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| Frame Type | FAL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Enclosures, Switchboards, Motor Control Centers |
| Wire Gauge | 14-1/0 AWG (Cu), 12-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG (Cu) / 12 AWG (Al) |
| 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 (120-240VAC), Lugs (AL100FA) |
| Standards | UL 489, CSA C22.2 No. 5, NEMA AB 1, HACR Rated |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat does the "-1021" suffix indicate on the FAL34100-1021 catalog number?
The "-1021" suffix designates a factory-installed 120-240VAC shunt trip, which allows the circuit breaker to be tripped remotely for emergency stops or control logic.
What is the modern replacement for the legacy FAL34100-1021 breaker?
The FAL34100-1021 is part of the legacy Square D F-Frame series. For modern upgrades or new builds, it crosses over to the PowerPact B-Frame series, specifically the BDL36100SA when equipped with a shunt trip.
What equipment is the FAL34100-1021 designed to be installed in?
This unit-mount MCCB is compatible with Square D enclosures, switchboards, and motor control centers that accept legacy F-Frame breakers.
What are the acceptable wire sizes for the line and load lugs on this breaker?
The included lugs accept 14 AWG to 1/0 AWG copper conductors, or 12 AWG to 1/0 AWG aluminum conductors.
Can the FAL34100-1021 be applied in DC electrical systems?
Yes, this thermal-magnetic breaker is rated for DC applications up to 250VDC, providing an interrupting rating of 10kAIC at that voltage.
How is the FAL34100-1021 mounted?
This is a unit-mount circuit breaker. It fastens directly to a backpan or mounting bracket and connects to the circuit via wire lugs, rather than plugging or bolting onto a panelboard busbar.
Can the trip curve be adjusted on the FAL34100-1021?
No, this breaker uses a fixed thermal-magnetic trip unit. Both the long-time (overload) and instantaneous (short circuit) trip functions are factory set and non-adjustable.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 39 reviews.
Reviews Summary
Generated by AI from 39 most recent customer reviews
Last updated 9/25/26
Customers say this circuit breaker arrives in excellent condition and works as expected. The product performs flawlessly and functions reliably. Many reviews highlight fast shipping, competitive pricing, and quick delivery times. Users appreciate the availability of refurbished and obsolete models. The parts arrive well-packed and in like-new condition. Common feedback addresses excellent communication and straightforward ordering. Overall, customers report satisfaction with product quality, value, and prompt service fulfillment.
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Rating
39 reviews
- PCPierre C.Verified BuyerReviewingSquare D FAL3603015M - 30A 3 Pole Motor Circuit ProtectorI recommend this productRated 5 out of 5 stars9/15/26Great service!!!
Bought this to replace the faulty one. Shipped overnight and arrived at noon as promised. Works as new. Very happy with this. Awesome help from the staff. Definitely my go to place now.
Thank you.
- MBMichael B.Verified BuyerReviewingSquare D FAL32030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/13/26Great product
This item worked as expected and is good quality. SuperBreakers did a great job with communication and delivery.
- ZBZachary B.Verified BuyerReviewingSquare D FAL36040 - 40A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/23/26Perfect
Exactly what we needed and worked flawlessly. Thanks
- JRJohn R.Verified BuyerReviewingSquare D FAL36100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/29/26Circuit Breaker
The breaker was in "like new" condition and well packed for shipping. Excellent value overall!
- RFRon F.Verified BuyerReviewingSquare D FAL340801021 - 80A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/13/26Square D FAL340801021 - 80A 3 Pole Molded Case Circuit Breaker
As usual SB has the best price and delivery was spot on!