Square D QOU21001021 Miniature Circuit Breaker
- 100A
- 2 Pole
- Unit Mount
Square D
QOU21001021
Miniature Circuit Breaker
Brand
Square D
SKU
QOU21001021
Quantity
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Square D QOU21001021 - 100A 2 Pole Miniature Circuit Breaker
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Description
Engineered for demanding applications, the Square D QOU21001021 is a 2-pole, 100A miniature circuit breaker. It utilizes a versatile unit-mount design that accommodates commercial and industrial electrical setups. This model mounts effortlessly onto DIN rails or within OEM control panels. It is equipped with reversible line and load lugs, accepting 12-2/0 AWG wire. A factory-installed 120/240VAC shunt trip allows for safe remote tripping, while the Visi-Trip indicator simplifies maintenance.Specifications
| Brand | Square D |
|---|---|
| Series | QOU |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 120/240VAC, 60VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 60VDC |
| Frame Type | QOU |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | DIN Rail Systems, OEM Panels, Control Panels, Enclosures |
| Wire Gauge | 12-2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 12 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Mounting Feet, Padlock Attachment, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
Product FAQs
6 answersWhat does the "1021" suffix mean in the QOU21001021 part number?
The "1021" suffix indicates that this breaker includes a factory-installed shunt trip accessory. This allows the breaker to be tripped remotely using a 120V, 208V, or 240V AC control voltage.
Can I install the QOU21001021 in a standard QO load center?
No, QOU series breakers are unit-mount (cable-in/cable-out) devices designed for DIN rail systems, control panels, and OEM enclosures. They do not plug into standard QO load centers.
What is the recommended tightening torque for the box lugs on the QOU21001021?
The slotted box lugs on both the line and load sides should be torqued to 45 lb-in (5.08 N.m) for all accepted wire sizes (12 AWG to 2/0 AWG).
How is the QOU21001021 breaker mounted?
As a QOU series breaker, it is a unit-mount (cable-in/cable-out) device. It can be surface-mounted, flush-mounted, or installed on a standard 35mm DIN rail using the appropriate mounting hardware.
Does the QOU21001021 feature a Visi-Trip indicator?
Yes, this breaker includes Square D's signature Visi-Trip indicator, which provides a highly visible red flag to quickly identify a tripped circuit.
Is the QOU21001021 breaker HACR rated?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment that requires this specific certification.
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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!