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Square D QOB250-1021 QOB2501021 - 50A 2 Pole Miniature Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Square D
QOB250-1021
QOB2501021 - 50A 2 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOB250-1021
Quantity
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Square D QOB2501021 - 50A 2 Pole Miniature Circuit Breaker
Re-Certified
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Square D QOB2501021 - 50A 2 Pole Miniature Circuit Breaker
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Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB2501021 |
| Series | QOB |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| 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 (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Sold out
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Square D QOB2501021 - 50A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB2501021-R |
| Series | QOB |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| 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 (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
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Description
Part of the QO family, the Square D QOB250-1021 is a two-pole, 50A miniature circuit breaker. It operates at 120/240VAC and includes a factory-installed 120/208/240V shunt trip mechanism for remote circuit interruption. This bolt-on breaker mounts into NQ and NQOD panelboards, ensuring a secure connection. The box lug terminals accommodate 8-2 AWG wiring for versatile installation.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB2501021-R |
| Series | QOB |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| 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 (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat does the 1021 suffix mean on this breaker?
The 1021 suffix indicates that this circuit breaker includes a factory-installed 120/240V AC shunt trip. This allows the breaker to be tripped remotely using a push button or other pilot device.
How many panel spaces does the QOB250-1021 require?
This 2-pole circuit breaker requires three panel spaces. The factory-installed shunt trip module occupies one additional space alongside the two poles used for standard overcurrent protection.
Can I add a shunt trip to a standard QOB250 breaker in the field?
No. Shunt trips for QO and QOB miniature circuit breakers must be factory-installed. If your application requires remote tripping, you must purchase a breaker with the shunt trip already attached, such as the QOB250-1021.
How do I wire the shunt trip on the QOB250-1021?
The shunt trip module features its own terminals that accept two 14 to 12 AWG copper wires. The hot and neutral control wires can be connected to either terminal to supply the 120V or 240V AC signal required to trip the breaker.
Does this breaker feature a tripped status indicator?
Yes, it includes the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent condition or a shunt trip signal, the handle moves to a center position and a highly visible red flag appears in the indicator window.
Is the QOB250-1021 suitable for HVAC equipment?
Yes, this circuit breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires group motor applications.
Can I install this breaker in a standard QO load center?
No. The QOB250-1021 is a bolt-on circuit breaker designed specifically for NQ and NQOD panelboards. Standard QO load centers require plug-on circuit breakers.
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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 206 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
206 reviews
- KHKristopher H.Verified BuyerReviewingSquare D QOB120GFI - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/28/26Great Price!
Great price. Fast delivery. My local electric distributor wanted double for the same breaker, so it was a no brainer to order this one. Ordered another one since with the same great service.
- 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.