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Square D QOU350 Miniature Circuit Breaker
- 50A
- 3 Pole
- Unit Mount
Square D
QOU350
Miniature Circuit Breaker
Brand
Square D
SKU
QOU350
Quantity
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Square D QOU350 - 50A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOU350 - 50A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOU350 |
| 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 | OEM Panels, Control Panels, DIN Rail Systems, 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 | Padlock Attachment, Mounting Feet, Quick Connectors |
|---|---|
| Accessories | Line and Load Lugs Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CE, CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Reverse Feed |
Sold out
Quantity
Square D QOU350 - 50A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOU350-R |
| 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 | OEM Panels, Control Panels, DIN Rail Systems, 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 | Padlock Attachment, Mounting Feet, Quick Connectors |
|---|---|
| Accessories | Line and Load Lugs Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CE, CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Reverse Feed |
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Description
Engineered for reliable power distribution, the Square D QOU350 is a 50A, 3-pole miniature circuit breaker. It utilizes proven thermal-magnetic trip technology to defend circuits against overloads and short circuits. This adaptable breaker mounts into OEM interiors, control panels, and DIN rail configurations. It includes box lugs that accept 14-2 AWG wiring, supporting reverse feed applications. Capable of 10 kAIC at 240VAC, it carries an HACR rating and features a Visi-Trip window.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOU350 |
| 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 | OEM Panels, Control Panels, DIN Rail Systems, 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 | Padlock Attachment, Mounting Feet, Quick Connectors |
|---|---|
| Accessories | Line and Load Lugs Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CE, CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Reverse Feed |
Product FAQs
6 answersCan I install the Square D QOU350 in a standard QO load center?
No. The QOU series consists of unit-mount breakers designed for control panels, DIN rail systems, and OEM enclosures. It does not have the plug-on or bolt-on mounting mechanisms required for standard QO or QOB panelboards.
How is the QOU350 circuit breaker mounted?
This unit-mount breaker is highly versatile and can be snapped directly onto a standard 35mm DIN rail. It can also be surface-mounted or flush-mounted using its built-in mounting feet, making it ideal for custom OEM enclosures.
How are the line and load connections made on this breaker?
The breaker features a feed-thru connection utilizing reversible line and load box lugs on both ends. This eliminates the need for a busbar, allowing you to terminate 14 to 2 AWG aluminum or copper wiring directly to the top and bottom of the unit.
Is the QOU350 rated for direct current (DC) applications?
Yes, in addition to its AC ratings, this breaker is rated for up to 48VDC with a 5kA interrupting capacity. This makes it suitable for various low-voltage DC control circuits and industrial applications.
Does this breaker meet the requirements for HVAC equipment?
Yes, the QOU350 is HACR rated. It is fully approved for providing overcurrent and short-circuit protection for heating, air conditioning, and refrigeration equipment.
Can I add terminal covers to the QOU350 for additional safety?
Yes, Square D manufactures optional finger-safe covers specifically for the QOU series. These covers slide over the box lugs to help prevent accidental contact with live terminals in open control panels.
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Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
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All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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!