Square D FAL34100-1388 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Unit Mount
Quantity
Square D FAL34100-1388 - 100A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for commercial distribution, the Square D FAL34100-1388 delivers reliable 100A thermal-magnetic protection for 480VAC systems. Designed for unit mounting, it integrates seamlessly into Square D enclosures and switchboards. This legacy F-Frame model is replaced by the HGL36100. This configuration features a factory-installed 277-480VAC shunt trip and a 1A/1B auxiliary switch for advanced remote tripping and status signaling.Specifications
| Brand | Square D |
|---|---|
| Part Number | FAL34100-1388 |
| 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 |
| 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 | Line and Load Lugs Included, Auxiliary Switch (1A/1B) (Factory Installed), Shunt Trip (277-480VAC) (Factory Installed) |
| Standards | CSA C22.2 No. 5, HACR Rated, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
8 answersWhat does the -1388 suffix indicate on the FAL34100-1388?
The -1388 suffix designates that this breaker is factory-equipped with a 1A/1B auxiliary switch and a 277-480VAC shunt trip mechanism.
What is the modern replacement for the legacy FAL34100-1388?
The legacy Square D F-frame series has been superseded by the PowerPact H-frame line. The direct replacement is the HGL36100, though you will need to add the equivalent field-installable shunt trip and auxiliary switch accessories to match the -1388 configuration.
How is the FAL34100-1388 installed in a system?
This is a unit-mount, feed-thru circuit breaker. It bolts directly to the backplate of Square D enclosures, switchboards, or motor control centers, and uses wire lugs on both the line and load sides rather than plugging onto a busbar.
What wire gauges are compatible with the standard lugs on this breaker?
The factory-installed lugs accept 14 AWG to 1/0 AWG copper conductors, or 12 AWG to 1/0 AWG aluminum conductors.
Is the FAL34100-1388 rated for direct current (DC) applications?
Yes, this thermal-magnetic breaker is rated for up to 250VDC with a 10kAIC interrupting capacity, making it suitable for specific DC control or battery circuits.
Can I adjust the trip settings on the FAL34100-1388?
No, this breaker features fixed thermal and fixed magnetic trip elements. The long-time and instantaneous (LI) protection functions cannot be adjusted in the field.
What equipment is the FAL34100-1388 designed to be used with?
This F-frame molded case circuit breaker is compatible with legacy Square D enclosures, switchboards, and motor control centers designed to accept unit-mount F-frame breakers.
What are the maximum short-circuit interrupting ratings for this breaker?
The breaker is rated to safely interrupt up to 25kA at 240VAC, 18kA at 480VAC, and 10kA at 250VDC.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 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!