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Square D QOU330 Miniature Circuit Breaker
- 30A
- 3 Pole
- Unit Mount
Square D
QOU330
Miniature Circuit Breaker
Brand
Square D
SKU
QOU330
Quantity
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Square D QOU330 - 30A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOU330 - 30A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOU330 |
| Series | QOU |
| Amperage | 30A |
| 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, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
Sold out
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Square D QOU330 - 30A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOU330-R |
| Series | QOU |
| Amperage | 30A |
| 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, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
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Description
Designed for versatile application, the QOU330 delivers 30A of thermal-magnetic protection across three poles. This unit mount miniature circuit breaker is ideal for DIN rail systems, OEM panels, and custom enclosures. It features Square D's signature Visi-Trip indicator for quick fault identification and reversible line/load lugs for simplified wiring. Rated at 10kAIC at 240VAC, it is HACR rated and built to handle demanding residential, commercial, and industrial loads.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOU330 |
| Series | QOU |
| Amperage | 30A |
| 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, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
Product FAQs
8 answersWhat is the recommended terminal torque for the QOU330?
The slotted box lugs on both the line and load sides require a tightening torque of 45 lb-in (5.08 N.m) when using 14 to 2 AWG copper or aluminum conductors.
What mounting methods are available for the QOU330 breaker?
This unit-mount circuit breaker can be surface-mounted, flush-mounted using accessory feet, or installed directly onto a standard 35mm symmetrical DIN rail (35 x 7.5 mm) in control panels.
Will the QOU330 plug into a standard Square D load center?
No. The QOU series consists of unit-mount, cable-in/cable-out breakers designed for OEM panels, control enclosures, and DIN rail systems. They do not plug into standard residential QO or Homeline load centers.
Is the QOU330 circuit breaker HACR rated?
Yes, it is UL Listed as an HACR type circuit breaker, making it approved for providing overcurrent protection to heating, air conditioning, and refrigeration equipment.
How does the QOU330 indicate a trip condition?
It is equipped with the Square D Visi-Trip indicator. When the breaker trips due to an overload or short circuit, the handle rests in a center position and a bright red flag appears in the indicator window for rapid troubleshooting.
Does the QOU330 support reverse feeding?
Yes, QOU miniature circuit breakers feature reversible line and load lugs, allowing for flexible top-feed or bottom-feed wiring configurations within custom equipment assemblies.
Can the QOU330 be utilized in direct current (DC) circuits?
Yes, in addition to its 120/240VAC ratings, the QOU330 is UL Listed for use in 48VDC electrical systems with a 5kA interrupting capacity.
What is the difference between Square D QO and QOU series breakers?
Both families share similar thermal-magnetic trip mechanisms and Visi-Trip technology, but QO breakers are plug-on devices for dedicated Square D load centers. QOU breakers feature built-in mounting provisions for standalone surface, flush, or DIN rail installations.
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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!