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Square D QOU245 Miniature Circuit Breaker
- 45A
- 2 Pole
- Unit Mount
Square D
QOU245
Miniature Circuit Breaker
Brand
Square D
SKU
QOU245
Quantity
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Square D QOU245 - 45A 2 Pole Miniature Circuit Breaker
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Description
Built for standalone applications, this 45-amp miniature breaker provides essential long-time and instantaneous trip functions. It accommodates a wide range of residential, commercial, and industrial electrical demands. The unit-mount construction allows for installation into custom enclosures, OEM panels, and DIN rail assemblies. Reversible box lugs accept 14-2 AWG aluminum or copper wire, simplifying the wiring process in tight spaces.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOU245 |
| Series | QOU |
| Amperage | 45A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 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 |
|---|---|
| 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, UL |
| Temp Rating | 40C |
Product FAQs
8 answersWhat is the difference between Square D QO and QOU circuit breakers?
QO breakers are plug-on style designed specifically for standard QO load centers. QOU breakers are unit-mount, cable-in/cable-out devices with terminal lugs on both ends. They are engineered for standalone enclosures, OEM panels, and control panels rather than standard residential load centers.
Will the QOU245 snap into a standard Square D QO load center?
No. This is a unit-mount breaker and does not have the plug-on jaws required for standard QO panelboards. It is designed exclusively for surface, flush, or DIN rail mounting.
How is the QOU245 mounted to a DIN rail?
The breaker can be mounted to a standard 35mm DIN rail using an accessory mounting foot. For a two-pole breaker like the QOU245, use the QOUMF2 mounting foot.
Are the line and load connections on this breaker reversible?
Yes. The slotted box lugs are reversible, allowing you to land the line or load wires on either the top or bottom terminals based on your panel layout.
What is the torque specification for the terminal lugs on the QOU245?
Tighten the slotted box lugs to 45 lb-in for 14 through 2 AWG copper or aluminum wire.
Is this circuit breaker HACR rated for HVAC applications?
Yes, the QOU245 is HACR rated, making it fully approved for use with heating, air conditioning, and refrigeration equipment that requires overcurrent protection.
Is the QOU245 approved for direct current circuits?
Yes, this breaker is rated for use on DC systems up to 48VDC, providing a maximum interrupting capacity of 5 kA on direct current applications.
What type of protection does the LI trip function provide?
The LI designation indicates a thermal-magnetic mechanism with Long-Time and Instantaneous protection. The long-time function handles sustained thermal overloads, while the instantaneous function clears short circuits immediately.
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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!