Square D FAL34040-1042 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Unit Mount
Quantity
Square D FAL34040-1042 - 40A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for heavy-duty power distribution, this 40A thermal-magnetic MCCB delivers long-time and instantaneous trip functions. It is designed to mount into standard Square D switchboards and industrial enclosures. This specific configuration includes a factory-installed 12-24VAC/DC shunt trip for remote tripping capabilities. While part of the legacy F-Frame family, it can be replaced by the HDL36040 when paired with an S29392 shunt trip accessory. Rated 18kAIC at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | FAL34040-1042 |
| Series | FAL |
| Amperage | 40A |
| 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, Panelboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (12-24VAC/DC), 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 -1042 suffix indicate on the FAL34040-1042 circuit breaker?
The -1042 suffix means this breaker includes a factory-installed 12V to 24V AC/DC shunt trip. This accessory allows the breaker to be tripped remotely by an external voltage signal, which is commonly used for emergency power-off (EPO) systems.
What is the modern replacement for the legacy FAL34040-1042 circuit breaker?
The FAL series is a legacy F-Frame breaker. The modern equivalent is the Square D PowerPact H-Frame series. You can replace this specific configuration with an HDL36040 circuit breaker paired with an S29392 shunt trip accessory.
Does the FAL34040-1042 plug onto a panelboard bus?
No, this is a unit-mount breaker. It must be individually mounted to a backpan or mounting plate using screws, and wired directly to the line and load side lugs.
Which panels and enclosures are compatible with the FAL34040-1042 breaker?
This unit-mount breaker is designed for use in standard Square D enclosures, switchboards, and industrial panelboards that are configured to accept F-Frame legacy breakers.
What type of protection does the LI trip unit provide?
The LI designation stands for Long-Time and Instantaneous. The fixed thermal element handles long-time overload protection, while the fixed magnetic element responds instantly to high-fault short circuits.
What wire sizes do the lugs on the FAL34040-1042 accept?
The line and load side lugs accept 14 AWG to 1/0 AWG copper wire, or 12 AWG to 1/0 AWG aluminum wire. Ensure proper torque specifications are followed during installation.
Does the FAL34040-1042 provide adequate interrupting capacity for 480V commercial systems?
It provides an 18kA interrupting capacity at 480VAC, which is suitable for many standard commercial applications. If installed on a 240VAC system, the interrupting capacity increases to 25kA.
Can the FAL34040-1042 be used in DC applications?
Yes, this thermal-magnetic breaker is rated for up to 250 VDC and provides a 10kA interrupting capacity at that voltage, making it suitable for specific industrial DC control circuits.
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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!