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Square D QOU335 Miniature Circuit Breaker
- 35A
- 3 Pole
- Unit Mount
Square D
QOU335
Miniature Circuit Breaker
Brand
Square D
SKU
QOU335
Quantity
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Square D QOU335 - 35A 3 Pole Miniature Circuit Breaker
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Description
Part of the Square D QO family, the QOU335 is a 3-pole, 35A miniature circuit breaker. It is engineered for OEM panels, control panels, and enclosures. This unit mount breaker easily integrates into DIN rail systems. It features reversible box lugs for 14-2 AWG wire, allowing for flexible surface, flush, or DIN rail mounting. Rated at 10 kAIC at 240VAC, it delivers reliable thermal-magnetic protection. The built-in Visi-Trip indicator allows for quick identification of tripped circuits.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOU335 |
| Series | QOU |
| Amperage | 35A |
| 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 (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, Auxiliary Switch, Alarm Switch, Shunt Trip |
|---|---|
| Accessories | 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 answersHow is the Square D QOU335 mounted in an enclosure?
The QOU335 is a unit-mount breaker that does not plug into a traditional panel bus. It can be installed on standard DIN rail systems, surface mounted, or flush mounted using mounting feet.
What is the difference between Square D QOU and QO circuit breakers?
QOU breakers, like the QOU335, are unit-mount breakers with box lugs on both the line and load sides for standalone or DIN rail mounting. Standard QO breakers are plug-on devices designed to connect directly to a load center bus bar.
What wire sizes and types are compatible with the QOU335 terminals?
The QOU335 features reversible line and load box lugs that accept 14 to 2 AWG copper or aluminum wire. This cable-in, cable-out design is ideal for feed-thru connections in OEM and control panels.
Is the QOU335 suitable for DC voltage applications?
Yes, in addition to its AC ratings, the QOU335 is rated for 48VDC with a 5 kAIC interrupting capacity, making it suitable for DC control circuits and specific OEM equipment.
Does the QOU335 feature a tripped circuit indicator?
Yes, this breaker includes the Square D Visi-Trip indicator. It provides a highly visible red signal when the breaker has tripped due to an overcurrent or short circuit event, allowing for quick troubleshooting.
Can I field-install a shunt trip or auxiliary switch on the QOU335?
QOU series circuit breakers support accessories like shunt trips, auxiliary switches, and alarm switches, but these are factory-installed components. They cannot be field-installed and must be ordered with the correct catalog suffix.
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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!