Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Square D QOU3301021 Miniature Circuit Breaker
- 30A
- 3 Pole
- Unit Mount
Square D
QOU3301021
Miniature Circuit Breaker
Brand
Square D
SKU
QOU3301021
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D QOU3301021 - 30A 3 Pole Miniature Circuit Breaker
New
Quantity
Similar Items
20A 3 Pole Miniature Circuit Breaker
15A 3 Pole Miniature Circuit Breaker
50A 3 Pole Miniature Circuit Breaker
Description
Part of the QOU series, this 3-pole 30A miniature circuit breaker provides reliable thermal-magnetic protection for commercial applications. It features a 10kAIC rating at 240VAC and includes Square D's Visi-Trip indicator for quick fault identification. Designed for installation flexibility, the unit mounts onto standard DIN rails or inside OEM control panels. This specific model includes a factory-installed 120/240VAC shunt trip accessory, allowing for remote tripping of the circuit.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOU330-1021 |
| 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 |
| Wire Gauge | 14-2 AWG |
| 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
8 answersWhat does the 1021 suffix mean in the QOU3301021 catalog number?
The 1021 suffix indicates that this circuit breaker includes a factory-installed 120, 208, or 240 VAC shunt trip accessory.
How many pole spaces does the QOU3301021 require in a panel?
Although it is a 3-pole circuit breaker, the factory-installed shunt trip accessory requires an additional pole space. This means the breaker will occupy four pole spaces in total.
Can I add a shunt trip to a standard QOU breaker in the field?
No. Shunt trips for QOU circuit breakers must be factory-installed. If your application requires a shunt trip, you must order a breaker with the appropriate suffix, such as the QOU3301021.
What wire sizes are accepted by the shunt trip terminals on this breaker?
The shunt trip terminals on QOU breakers accept two 14 to 12 AWG copper wires. The hot and neutral wires can be connected to either terminal.
Can the QOU3301021 be mounted on a DIN rail?
Yes, QOU unit-mount circuit breakers are designed for flexible installation. They can be DIN rail-mounted, surface-mounted, or flush-mounted in OEM and control panels.
How can I easily identify if the QOU3301021 has tripped?
This breaker features the Square D Visi-Trip indicator, which provides a highly visible red flag to help you quickly spot a tripped circuit breaker in a crowded control panel.
Does this breaker feature a common trip mechanism?
Yes, QOU multi-pole circuit breakers feature a single handle with an internal common trip mechanism. This ensures all poles open simultaneously during an overcurrent or short circuit event.
What is the difference between Square D QO and QOU circuit breakers?
QO breakers are designed to be installed in Square D load centers and panelboards. QOU breakers, like the QOU3301021, are unit-mount, cable-in and cable-out breakers designed for OEM applications, control panels, and DIN rail mounting.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
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.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
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.
Search
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!