Square D FAL340151021 Molded Case Circuit Breaker
- 15A
- 3 Pole
- Unit Mount
Quantity
Square D FAL340151021 - 15A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for commercial and industrial use, this 3-pole, 15A molded case circuit breaker belongs to the Square D F-Frame family. It delivers robust thermal-magnetic protection for heavy-duty electrical systems. The unit mount design secures into Square D enclosures, switchboards, and panelboards via standard lug connections. While replaced by the HDL36015, it remains essential for legacy maintenance. This model features an 18 kAIC rating at 480VAC and a built-in 120-240VAC shunt trip.Specifications
| Brand | Square D |
|---|---|
| Part Number | FAL340151021-R |
| Series | FAL |
| Amperage | 15A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Enclosures, Switchboards, Panelboards |
| Wire Gauge | 14-4 AWG (Cu), 12-4 AWG (Al) |
| Max Wire | 4 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, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (120-240VAC), Lugs |
| 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, Visual Trip Indicator, HID Rated |
Product FAQs
8 answersWhat does the 1021 suffix indicate on the Square D FAL340151021?
The 1021 suffix signifies that this breaker includes a factory-installed 120/240VAC shunt trip. This allows the breaker to be tripped remotely by applying a voltage signal, which is commonly used for emergency stop circuits or automated control systems.
Can I use a modern PowerPact breaker to replace the FAL340151021?
While the legacy F-frame series has been superseded by the PowerPact H-frame (such as the HDL36015), upgrading often requires panel modifications or adapter kits. Using the exact FAL340151021 replacement ensures a direct fit in your existing Square D switchboard or panelboard.
What are the wire size requirements for the standard lugs on this 15A breaker?
The factory lugs accommodate 14 to 4 AWG copper conductors or 12 to 4 AWG aluminum conductors. Ensure your wiring falls within this range and is torqued to the manufacturer specifications during installation.
Is the FAL340151021 suitable for 480V systems with high fault current?
This standard-interrupting FAL breaker provides an 18kAIC rating at 480VAC. If your system requires a higher interrupting capacity at 480V, you may need to source a high-interrupting FHL or extra-high-interrupting FCL frame breaker instead.
How does the FAL340151021 mount into an electrical panel?
This is a unit-mount breaker, meaning it bolts directly to the mounting pan or chassis of Square D enclosures, switchboards, and panelboards, rather than plugging onto a busbar like an I-Line breaker.
Are the thermal and magnetic trip settings adjustable on the FAL340151021?
No, this 15A breaker features a fixed thermal-magnetic trip unit. Both the long-time (thermal) and instantaneous (magnetic) protection functions are factory-set and cannot be adjusted in the field.
How is the shunt trip activated on the FAL340151021?
The factory-installed shunt trip requires connection to an external 120VAC or 240VAC control circuit. When voltage is applied to the control leads, the internal coil energizes and mechanically trips the breaker.
Does the FAL340151021 include line and load terminals?
Yes, this unit-mount breaker comes complete with mechanical lugs on both the line and load sides, allowing for direct wire termination without requiring additional hardware.
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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!