Square D QOU120-1021 QOU1201021 - 20A 1 Pole Miniature Circuit Breaker
- 20A
- 1 Pole
- Unit Mount
Square D
QOU120-1021
QOU1201021 - 20A 1 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOU120-1021
Quantity
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Square D QOU1201021 - 20A 1 Pole Miniature Circuit Breaker
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Description
The QOU120-1021 is a single-pole miniature circuit breaker from Square D. It features a factory-installed shunt trip accessory, allowing the breaker to be tripped remotely for enhanced control. This unit mount breaker is highly versatile, capable of being surface-mounted, flush-mounted, or installed onto standard 35mm DIN rails. It is commonly used in OEM panels and control enclosures. Rated for 10 kAIC at 120/240VAC, it includes the Visi-Trip indicator for quick fault identification.Specifications
| Brand | Square D |
|---|---|
| Series | QOU |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Unit Mount |
| Voltage | 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOU |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | DIN Rail Systems, OEM Panels, Enclosures, Control Panels |
| 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 Thermal, Fixed Magnetic |
| Available Options | Mounting Feet, Padlock Attachment, Terminal Shields |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489, HACR Rated |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Visual Trip Indicator, Reverse Feed |
Product FAQs
7 answersWhat does the -1021 suffix indicate on the QOU1201021 breaker?
The -1021 suffix signifies that this breaker includes a factory-installed 120/208/240 VAC shunt trip. This accessory allows the breaker to be opened remotely via a control signal.
Does the factory-installed shunt trip change the physical dimensions of the breaker?
Yes. The shunt trip mechanism adds one additional pole space to the device. Although it operates as a 1-pole 20A breaker, it requires the physical mounting space of a 2-pole breaker (1.5 inches wide).
Can I field-install a shunt trip on a standard QOU120 breaker instead of buying the QOU1201021?
No. Square D QOU shunt trips cannot be added in the field. They must be factory-installed, so you must purchase the specific -1021 catalog number if your application requires a 120/240 VAC remote trip function.
How do I wire the shunt trip terminals on this breaker?
The shunt trip accessory features its own terminals that accept up to two 14-12 AWG copper wires. The hot and neutral control wires can be connected to either terminal to activate the remote trip.
Is the QOU120-1021 suitable for HVAC equipment?
Yes, this miniature circuit breaker is HACR rated. It is approved for use with multi-motor and combination loads commonly found in heating, air conditioning, and refrigeration equipment.
How can I tell if the QOU1201021 has been tripped remotely by the shunt trip?
This breaker includes the Square D Visi-Trip indicator. Whether it trips from an overcurrent event or a remote shunt trip command, a bright red flag will appear in the window to help you quickly identify the tripped circuit.
How does the unit mount design of the QOU1201021 differ from standard QO breakers?
Unlike standard plug-on QO breakers, QOU breakers feature a cable-in/cable-out unit mount design. They can be surface-mounted, flush-mounted, or attached to a standard 35mm DIN rail, making them ideal for standalone OEM control panels.
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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!