Square D QOU270-1021 QOU2701021 - 70A 2 Pole Miniature Circuit Breaker
- 70A
- 2 Pole
- Unit Mount
Quantity
Square D QOU2701021 - 70A 2 Pole Miniature Circuit Breaker
New
Quantity
Description
Designed for advanced control, this 70A, two-pole miniature circuit breaker includes a factory-installed 120/240VAC shunt trip. It is ideal for commercial and industrial applications requiring remote shutdown capabilities. This unit-mount breaker installs onto standard 35mm DIN rails, surface mounts, or OEM enclosures. It accommodates 14-2 AWG wire and features reversible line and load lugs. Rated at 10kAIC, it includes Square D's Visi-Trip indicator for clear visual confirmation.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOU270-1021 |
| Series | QOU |
| Amperage | 70A |
| 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 Foot, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat does the -1021 suffix indicate on the QOU270-1021?
The -1021 suffix denotes that this breaker includes a factory-installed 120/208/240V AC shunt trip accessory. This feature allows the breaker to be opened remotely via an external voltage signal, which is critical for emergency shutdown systems and automated control circuits.
What is the difference between Square D QO and QOU circuit breakers?
While both series share similar thermal-magnetic mechanisms and the Visi-Trip indicator, their mounting styles differ. QO breakers are designed to plug into specific Square D load centers, whereas QOU breakers are unit-mounted. This allows the QOU270-1021 to be installed independently on DIN rails or flat surfaces for OEM and control panel applications.
How is the QOU270-1021 mounted in an electrical panel?
This is a unit-mount breaker. It does not plug or bolt onto a traditional busbar. Instead, it can be surface-mounted, flush-mounted, or snapped onto a standard 35mm DIN rail, making it ideal for OEM panels, control panels, and custom enclosures.
What are the wiring and connection capabilities of the QOU270-1021?
This breaker features a feed-thru design with slotted box lugs on both the line and load sides. It is fully tested and certified for reverse feeding, allowing for flexible wiring configurations without restrictive line or load markings. The lugs accept 14 AWG to 2 AWG aluminum or copper wire.
Is the QOU270-1021 suitable for DC applications?
Yes, in addition to standard AC applications, this breaker is rated for 48V DC systems with a 5 kA interrupting capacity. This makes it a viable option for industrial DC control circuits, telecommunications, and battery backup systems.
Does the QOU270-1021 provide visual trip indication?
Yes, it features the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent event, the handle moves to a midpoint position and a highly visible red indicator appears in a window on the case. This allows electricians to quickly identify the tripped circuit in a crowded panel.
How does the thermal-magnetic trip unit function on this breaker?
The fixed long-time and instantaneous (LI) trip functions work together to provide comprehensive overcurrent protection. The thermal component responds to sustained overloads by heating a bimetallic strip, while the magnetic component reacts immediately to severe short circuits to quickly open the contacts.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 108 reviews.
- MMMichael M.Verified BuyerReviewingSquare D QOU3100 - 100A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/13/26Excellent Customer service
We had a new piece of equipment come in that has a higher nameplate rating than was originally conveyed. The lead time from the supply house was outrageous at 10-12 weeks. We ordered it from SuperBreakers and had the equipment running in 3 days. Angel the sales rep. followed up several times first to confirm the order arrived and second that it was the correct
breaker.
- VBVictor B.Verified BuyerReviewingSquare D QOU280 - 80A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/6/26Square D QOU280
As advertised, works great under normal load conditions. We Recomend this product. Service and shipping was great and easy. Pleasure to deal with.
- 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.