Square D QOU3201200 Miniature Circuit Breaker
- 20A
- 3 Pole
- Unit Mount
Square D
QOU3201200
Miniature Circuit Breaker
Brand
Square D
SKU
QOU3201200
Quantity
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Square D QOU3201200 - 20A 3 Pole Miniature Circuit Breaker
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Description
Part of the QO family, the Square D QOU3201200 is a 3-pole, 20A miniature circuit breaker built for commercial and industrial applications. The unit-mount design installs into OEM panels, control enclosures, and DIN rail systems. It accepts 14-2 AWG wire and features reversible line and load lugs for flexible wiring. Rated 10 kAIC at 240VAC, this model includes a factory-installed auxiliary switch for remote status indication and a Visi-Trip indicator for quick fault spotting.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOU3201200 |
| Series | QOU |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | DIN Rail Systems, OEM Panels, Enclosures |
| Wire Gauge | 14-2 AWG (Al/Cu) |
| 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, Quick Connectors |
|---|---|
| Accessories | Auxiliary Switch (1A/1B) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Reverse Feed |
Product FAQs
6 answersHow is the QOU3201200 circuit breaker mounted?
This unit-mount breaker features built-in mounting feet for direct surface or flush mounting. It can also be installed on standard DIN rail systems, making it highly versatile for OEM panels and custom enclosures.
What does the 1200 suffix mean on the QOU3201200 catalog number?
The 1200 suffix indicates the inclusion of a factory-installed auxiliary switch. This specific switch provides one normally open (1NO) contact rated for 5 amps at 120V AC, which is typically used for remote status indication or signaling in control circuits.
Will this breaker fit in a standard Square D QO load center?
No. Although it is part of the QO family, the QOU series consists of unit-mount breakers designed for OEM applications and control panels. They do not have the plug-on jaws required to fit into standard QO or Homeline residential load centers.
Does the QOU3201200 feature a tripped status indicator?
Yes, this breaker includes the signature Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or short circuit, a highly visible red indicator appears to help you quickly identify the faulted circuit.
What type of protection does the LI trip function provide?
The thermal-magnetic trip unit features Long-Time (L) and Instantaneous (I) protection. The thermal element protects against sustained overloads, while the magnetic element provides instantaneous tripping during severe short circuits.
Can this 3-pole breaker be used in a single-phase application?
Yes, a 3-pole breaker can be safely used in a single-phase circuit by wiring only two of the poles. However, using a dedicated 2-pole breaker is generally more space-efficient for single-phase loads.
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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!