Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Square D QOU310 Miniature Circuit Breaker
- 10A
- 3 Pole
- Unit Mount
Square D
QOU310
Miniature Circuit Breaker
Brand
Square D
SKU
QOU310
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D QOU310 - 10A 3 Pole Miniature Circuit Breaker
New
Quantity
Similar Items
15A 3 Pole Miniature Circuit Breaker
20A 3 Pole Miniature Circuit Breaker
20A 3 Pole Miniature Circuit Breaker
Description
Part of the Square D QOU series, the QOU310 is a three-pole miniature breaker rated 10A at 240VAC or 48VDC. It provides essential thermal-magnetic protection for OEM equipment and control systems. This breaker features a unit-mount configuration, enabling it to be installed on DIN rails or surface-mounted into enclosures. It accepts 14-2 AWG aluminum or copper wiring. Rated for 10kA fault currents at 240VAC, it includes the Visi-Trip indicator to identify tripped circuits and is HACR rated.Specifications
| Brand | Square D |
|---|---|
| Series | QOU |
| Amperage | 10A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 48VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 5kA @ 48VDC |
| 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 Thermal, Fixed Magnetic |
| Available Options | Mounting Feet, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, HACR, IEC, RoHS, UL |
| Temp Rating | 40C |
Product FAQs
6 answersHow is the Square D QOU310 circuit breaker mounted?
The QOU310 is a unit-mount breaker designed for installation flexibility. It can be snapped onto standard DIN rails or flush- and surface-mounted directly into OEM enclosures and control panels.
What type of wire connections does the QOU310 use?
This breaker is equipped with reversible slotted box lugs on both the line and load sides. This allows panel builders to feed the breaker from either direction, simplifying wiring in tight enclosures. The terminals accommodate 14 to 2 AWG copper or aluminum conductors.
What applications is the QOU310 miniature circuit breaker designed for?
With its versatile unit-mount configuration, the QOU310 is commonly used in OEM panels, industrial control systems, HVAC equipment, and custom enclosures that require 10A, 3-phase thermal-magnetic protection.
Can the QOU310 be used in DC electrical systems?
Yes, in addition to its 120/240V AC rating, the QOU310 is rated for 48V DC applications. It provides a 5kA interrupting capacity for direct current circuits.
Is the QOU310 compatible with standard QO load centers?
No, the QOU310 is a unit-mount circuit breaker designed specifically for DIN rail or surface mounting. It does not plug into standard QO load centers or bolt onto QOB panelboards.
Can I add terminal protection to the QOU310?
Yes, finger-safe covers are available for the Square D QOU series. These covers install over the box lugs to prevent accidental contact with energized line and load terminals, enhancing safety during panel maintenance.
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!