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Square D QOB2701021 Miniature Circuit Breaker
- 70A
- 2 Pole
- Bolt-On
Square D
QOB2701021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB2701021
Quantity
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Square D QOB2701021 - 70A 2 Pole Miniature Circuit Breaker
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Description
Part of the QO family, this specialized two-pole breaker includes a factory-installed shunt trip accessory for remote circuit interruption. It installs into Square D NQ and NQOD panelboards, utilizing a bolt-on connection for secure commercial and industrial applications. Rated at 70 amps and 10 kAIC at 120/240VAC, the QOB2701021 features thermal-magnetic trip technology and box lug terminals. The integrated Visi-Trip indicator provides clear visual confirmation when the breaker trips.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB270-1021 |
| Series | QOB |
| Amperage | 70A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 48VDC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Square D NQ Panelboards, Square D NQOD Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat does the 1021 suffix indicate on the QOB2701021 circuit breaker?
The 1021 suffix means this breaker includes a factory-installed 120/208/240 VAC shunt trip accessory. This allows the breaker to be tripped remotely using an external voltage signal, which is commonly used for emergency stops or automated control systems.
Which panelboards are compatible with the QOB2701021 breaker?
This bolt-on miniature circuit breaker is designed specifically for use in Square D NQ and NQOD series panelboards. It is not compatible with standard QO load centers, which require plug-on style breakers.
How does the QOB2701021 connect to the panelboard bus?
The QOB series uses a bolt-on connection to secure the breaker directly to the panelboard bus. This provides a robust, vibration-resistant mechanical and electrical connection suitable for commercial and industrial applications.
What wire sizes are accepted by the box lugs on the QOB2701021?
The box lugs on this 70A breaker accept aluminum or copper conductors ranging from 8 AWG to 2 AWG. Always torque the terminals to the manufacturer specifications printed on the breaker label.
Can the QOB2701021 be used in DC applications?
Yes, this thermal-magnetic breaker is rated for use on DC systems up to 48VDC, where it provides a 5kA interrupting rating.
Does this breaker feature a visual trip indicator?
Yes, it includes the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent, short circuit, or a remote shunt trip signal, a highly visible red indicator appears in the window to help quickly identify the tripped circuit.
What type of trip mechanism does the QOB2701021 utilize?
It uses a fixed thermal-magnetic trip unit. The thermal element provides long-time protection against overloads, while the magnetic element provides instantaneous protection against short circuits. The integrated shunt trip also allows for remote safety tripping.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 205 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 3/11/26
Customers say these electrical breakers arrive exactly as ordered and work perfectly for their intended applications. They consistently praise the competitive pricing, which many report is significantly lower than local suppliers. Fast shipping and prompt delivery are frequently highlighted, with many receiving orders within days or even next-day delivery for urgent needs. The breakers arrive well-packaged and in excellent condition. Many reviews emphasize the company's extensive inventory availability, particularly for hard-to-find breakers. One customer experienced difficulty with order cancellation and was charged a restocking fee, which caused dissatisfaction.
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Rating
205 reviews
- BLBOOSTIX L.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/17/26QOB220
That's nice breakers!
- PHPaul H.Verified BuyerReviewingSquare D QOB330 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/5/26Quick shipping and delivery
Shipped and delivered on time for installation at one of our projects. Thank you!
- RMRick M.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Project Mgr
Just what I needed.
- DHDoug H.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Square D QOB breakers
As always, our order arrived timely, and accurate. You can’t beat their prices that’s why we have used this company for years.
- RKRyan K.Verified BuyerReviewingSquare D QOB230VH - 30A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/1/26Awesome
Worked great