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Square D QOB3701021 Miniature Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Square D
QOB3701021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB3701021
Quantity
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Square D QOB3701021 - 70A 3 Pole Miniature Circuit Breaker
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Description
Providing advanced control for commercial facilities, this 70A thermal-magnetic breaker includes a factory-installed shunt trip. This permits remote tripping when voltage is applied. Designed for robust power distribution, the device fastens firmly into Square D NQ and NQOD panelboards. The bolt-on design guarantees a secure connection that resists vibration. A highly visible red Visi-Trip indicator simplifies troubleshooting by highlighting faults instantly. It is also HACR certified.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC, 10kA @ 120/240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, 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 | Shunt Trip |
| Standards | UL 489, CSA C22.2 No. 5, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Common Trip |
Product FAQs
5 answersCan the QOB3701021 be installed in a standard Square D QO load center?
No. The QOB3701021 features a bolt-on connection designed exclusively for Square D NQ and NQOD panelboards. Standard QO load centers require plug-on breakers.
What does the 1021 suffix indicate on this Square D breaker?
The 1021 suffix means this breaker includes a factory-installed 120/208/240V AC shunt trip accessory. This allows the breaker to be tripped from a remote location using a separate voltage signal.
What control voltage is required to operate the shunt trip on the QOB3701021?
The factory-installed shunt trip requires a control voltage of 120V, 208V, or 240V AC. Applying this voltage to the accessory leads will remotely open the breaker contacts.
Does the QOB3701021 feature a visual trip indicator?
Yes, it includes the signature Square D Visi-Trip indicator. When the breaker trips, a highly visible red flag appears in the window to help you quickly identify the faulted circuit.
Is the QOB3701021 suitable for HVAC applications?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires this specific certification.
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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.
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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