Square D QOU3401200 Miniature Circuit Breaker
- 40A
- 3 Pole
- Unit Mount
Square D
QOU3401200
Miniature Circuit Breaker
Brand
Square D
SKU
QOU3401200
Quantity
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Square D QOU3401200 - 40A 3 Pole Miniature Circuit Breaker
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Description
Part of the QOU series, the Square D QOU3401200 is a 3-pole, 40A miniature circuit breaker designed for commercial power distribution. It features a factory-installed 1A/1B auxiliary switch for remote status signaling. This unit-mount breaker installs easily into OEM panels, control enclosures, and DIN rail systems. It features reversible box lugs accommodating 14-2 AWG wire for flexible feed-through wiring. Rated 10 kAIC at 240VAC, it is HACR rated and includes a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Series | QOU |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOU |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | DIN Rail Systems, OEM Panels, Control Panels, Enclosures |
| Wire Gauge | 14-2 AWG |
| Max Wire | 2 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Mounting Feet, Padlock Attachment |
|---|---|
| Accessories | Auxiliary Switch (Factory Installed), Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489, HACR Rated |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
Product FAQs
6 answersWhat does the 1200 suffix mean on the QOU3401200?
The 1200 suffix indicates that this circuit breaker includes a factory-installed auxiliary switch. This switch provides a contact for remote signaling or status monitoring in control circuits.
How is the QOU3401200 circuit breaker mounted?
This is a unit-mount breaker designed for surface, flush, or DIN rail mounting. It is commonly used in OEM equipment, control panels, and custom enclosures rather than standard plug-on or bolt-on load centers.
Can I reverse the line and load connections on this breaker?
Yes. QOU circuit breakers feature a feed-thru design with box lugs on both ends. They are UL Listed for reverse connection without restrictive line or load markings, allowing for flexible wiring configurations in tight panels.
Is the QOU3401200 suitable for use with heating, air conditioning, and refrigeration equipment?
Yes, this breaker is HACR rated, making it suitable for group motor applications found in HVAC and refrigeration systems.
Will this breaker fit in a standard Square D QO load center?
No. While it is part of the QO family, the QOU frame is a unit-mount, feed-thru breaker. It does not have the plug-on or bolt-on clips required to install in standard QO or NQ panelboards.
How does the breaker indicate that it has tripped?
It features the Square D Visi-Trip indicator. When the breaker trips, the handle moves to a center position and a highly visible red indicator appears in a window on the breaker case, allowing for quick identification of a faulted circuit.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 106 reviews.
Reviews Summary
Generated by AI from 99 most recent customer reviews
Last updated 5/14/26
Customers say these circuit breakers function properly and arrive quickly. Many reviews highlight fast shipping, competitive pricing, and reliable product condition upon arrival. Users appreciate the wide selection, including hard-to-find models, and note the breakers work as expected for various applications. Common feedback addresses quick order processing and easy website navigation. Most customers report satisfaction with value and delivery speed, with many indicating they will purchase again.
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Rating
106 reviews
- HLHOMETIGO L.Verified BuyerReviewingSquare D QOU260 - 60A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/7/26Good thing
i recommend this for you
- RGRobert G.Verified BuyerReviewingSquare D QOU340 - 40A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/3/26Circuit breakers
I appreciate the fact that you had these in stock. my Square D distributor does not seem to stock these anymore and it takes a couple weeks to get. your pricing is inline with theirs.
- THTiffany H.Verified BuyerReviewingSquare D QOU115 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/28/26Will use Super Breakers again
Arrived in a timely manner. Exactly what we needed for a job.
- CSCary S.Verified BuyerReviewingSquare D QOU250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/12/26Just what I ordered
Just what I needed for dock pedestal
- MHMark H.Verified BuyerReviewingSquare D QOU250VH - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/11/26Square D QOU250VH - 50A 2 Pole Miniature Circuit Breaker
Was just what I expected!