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Square D QOU3501021 Miniature Circuit Breaker
- 50A
- 3 Pole
- Unit Mount
Square D
QOU3501021
Miniature Circuit Breaker
Brand
Square D
SKU
QOU3501021
Quantity
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Square D QOU3501021 - 50A 3 Pole Miniature Circuit Breaker
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Description
Engineered for commercial and industrial applications, the QOU3501021 provides robust thermal-magnetic protection. This 50-amp, three-pole miniature circuit breaker is designed for versatile installation across multiple environments. It mounts seamlessly into OEM panels, control enclosures, and DIN rail systems using a standard unit-mount configuration. The reversible line and load lugs offer flexible wiring options. Rated 10 kAIC at 240V, this model includes a factory-installed shunt trip.Specifications
| Brand | Square D |
|---|---|
| Series | QOU |
| Amperage | 50A |
| 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 |
| 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 | Padlock Attachment, Mounting Feet |
|---|---|
| Accessories | Shunt Trip (Factory Installed) |
| 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, Visual Trip Indicator |
Product FAQs
7 answersWhat does the 1021 suffix mean on the QOU3501021 circuit breaker?
The 1021 suffix indicates that this breaker includes a factory-installed shunt trip accessory.
Will the QOU3501021 fit into a standard Square D QO load center?
No. QOU series breakers are unit-mount devices designed for DIN rail systems, OEM panels, and control enclosures. They do not plug onto the busbars of standard QO load centers.
How is the QOU3501021 mounted?
This breaker utilizes a unit-mount configuration. It can be surface-mounted, flush-mounted, or attached to a standard DIN rail, offering flexible installation options for control panels.
Are the line and load connections reversible on this breaker?
Yes. The QOU3501021 is a feed-thru breaker with reversible line and load lugs, allowing you to wire the supply voltage to either end of the device.
What are the physical dimensions of the QOU3501021 breaker?
This breaker measures approximately 4.05 inches in height, 3.00 inches in width, and 2.95 inches in depth. The 3.00-inch width accounts for the three breaker poles plus the factory-installed shunt trip, which requires an additional pole space.
How can I tell if the QOU3501021 has tripped?
This breaker includes the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or short circuit, a red indicator window appears to help you quickly identify the faulted circuit.
Is this breaker approved for HVAC applications?
Yes, the QOU3501021 is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment.
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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!