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Square D QOB3801021 Miniature Circuit Breaker
- 80A
- 3 Pole
- Bolt-On
Square D
QOB3801021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB3801021
Quantity
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Square D QOB3801021 - 80A 3 Pole Miniature Circuit Breaker
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Description
Featuring a factory-installed 120/208/240VAC shunt trip mechanism, the QOB3801021 enables remote tripping capabilities for safety and control applications. This 80-amp, three-pole device fastens into Square D NQ and NQOD panelboards using a secure bolt-on connection. The assembly requires four pole spaces due to the integrated accessory. It delivers standard 10kAIC protection at 240V and includes the Visi-Trip visual indicator to simplify maintenance and troubleshooting.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 80A |
| 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 | 4 AWG - 2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 4 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 (120/208/240VAC) |
| Standards | CSA C22.2 No. 5, HACR, RoHS, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
7 answersCan I install the QOB3801021 in a standard QO load center?
No. The QOB3801021 is a bolt-on circuit breaker designed specifically for Square D NQ and NQOD panelboards. It cannot be installed in standard QO plug-on load centers or Homeline panels.
How many panel spaces does the QOB3801021 require?
Although it is a 3-pole breaker, it requires four pole spaces in your panelboard. The factory-installed shunt trip mechanism occupies the additional space.
What does the 1021 suffix indicate on this Square D breaker?
The 1021 suffix means the breaker includes a factory-installed shunt trip mechanism configured for 120, 208, or 240 VAC operation. This allows the breaker to be tripped remotely for safety or control applications.
What size wire does the shunt trip terminal accept?
The shunt trip accessory terminals accept up to two 14 AWG to 12 AWG copper wires. The primary breaker lugs accept 4 AWG to 2/0 AWG aluminum or copper wire.
Can I add a shunt trip to a standard QOB380 breaker in the field?
No. Square D shunt trips for QO and QOB breakers must be factory-installed. You must order a breaker with the appropriate suffix, such as the QOB3801021, if remote tripping is required.
Does this breaker feature a tripped indicator?
Yes, it includes the Square D Visi-Trip visual indicator. When the breaker trips, a highly visible red flag appears in the indicator window to help you quickly identify the tripped circuit.
Is this breaker HACR rated?
Yes, the QOB3801021 is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment that requires this specific certification.
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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