Square D QOU170 Miniature Circuit Breaker
- 70A
- 1 Pole
- Unit Mount
Square D
QOU170
Miniature Circuit Breaker
Brand
Square D
SKU
QOU170
Quantity
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Square D QOU170 - 70A 1 Pole Miniature Circuit Breaker
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Description
Part of the Square D QOU series, this 70A single-pole miniature circuit breaker provides dependable thermal-magnetic protection for commercial and industrial applications. The unit mount design allows for versatile installation, easily integrating into OEM panels, control panels, and DIN rail systems. Rated at 10kAIC at 120/240VAC, it features the exclusive Visi-Trip indicator for rapid fault identification and reversible lugs for wiring flexibility.Specifications
| Brand | Square D |
|---|---|
| Series | QOU |
| Amperage | 70A |
| Poles | 1 |
| 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 | Visi-Trip Indicator |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
Product FAQs
6 answersWhat types of enclosures or systems accept the QOU170 breaker?
As a unit-mount breaker, it is designed for OEM panels, control panels, and custom enclosures rather than standard residential load centers. It can be surface-mounted, flush-mounted, or installed on a 35mm DIN rail using the appropriate Square D mounting bracket.
What is the recommended tightening torque for the box lug terminals?
The slotted box lugs on the line and load sides should be torqued to 45 lb-in when using 14 to 2 AWG copper or aluminum wire.
Is this breaker HACR rated for HVAC applications?
Yes, the QOU170 is HACR and Switching Duty rated, making it approved for use with heating, air conditioning, and refrigeration equipment.
Can the QOU170 be used in direct current circuits?
Yes, it is rated for DC applications up to 48VDC with a 5kAIC interrupting rating. This makes it suitable for specific battery systems, solar applications, and industrial control panels.
Are there lockout accessories available for the QOU170?
Yes, Square D offers compatible padlock attachments, such as the QOU1PAFLA, which allow you to lock the breaker handle for standard lockout and tagout safety procedures.
Does this breaker provide a visual trip indication?
Yes, it features the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or short circuit, the handle snaps to a midpoint position and displays a highly visible red indicator.
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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!