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Square D QOB115-1021 Miniature Circuit Breaker
- 15A
- 1 Pole
- Bolt-On
Square D
QOB115-1021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB115-1021
Quantity
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Square D QOB115-1021 - 15A 1 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOB115-1021 - 15A 1 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB115-1021 |
| Series | QOB |
| Amperage | 15A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch |
|---|---|
| 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, SWD Rated |
Sold out
Quantity
Square D QOB115-1021 - 15A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB1151021-R |
| Series | QOB |
| Amperage | 15A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch |
|---|---|
| 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, SWD Rated |
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Description
Part of the QO family, this 15-amp single-pole breaker provides thermal-magnetic protection alongside remote tripping capabilities. It is engineered for commercial systems requiring a 120/240VAC rating. This bolt-on unit installs into Square D NQ and NQOD panelboards. The secure mounting style ensures a stable connection to the busbar. A factory-installed shunt trip distinguishes this model, allowing the breaker to be opened remotely.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB115-1021 |
| Series | QOB |
| Amperage | 15A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch |
|---|---|
| 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, SWD Rated |
Product FAQs
8 answersWhat does the "-1021" suffix indicate on the Square D QOB115-1021?
The "-1021" suffix designates that this breaker includes a factory-installed 120/240VAC shunt trip accessory, which allows the breaker to be opened remotely via a control signal.
Which panelboards are compatible with the QOB115-1021 circuit breaker?
This bolt-on miniature circuit breaker is designed specifically for use in Square D NQ and NQOD commercial panelboards.
Can the bolt-on QOB115-1021 be installed in a standard QO load center?
No. The QOB115-1021 features a bolt-on connection designed for commercial NQ and NQOD panelboards. Standard residential QO load centers require plug-on breakers, such as the QO115-1021.
How does the QOB115-1021 connect to the panelboard busbar?
It features a bolt-on connection type, which securely fastens the breaker directly to the panelboard busbar using a screw, ensuring a reliable connection in commercial environments.
What type of conductors can be landed on the QOB115-1021 terminals?
The pressure plate terminals are rated for both aluminum and copper (Al/Cu) conductors, accepting wire sizes from 14 AWG up to 8 AWG for flexible installation.
Is the QOB115-1021 suitable for low-voltage DC control circuits?
Yes, this breaker is dual-rated for both AC and DC systems. It can safely interrupt up to 5kA in 48VDC applications, making it suitable for specific low-voltage DC control or battery circuits.
Does the QOB115-1021 provide adequate interrupting capacity for standard commercial panels?
Yes, it provides a 10kAIC interrupting rating at 120/240VAC, which meets the standard fault current requirements for most light commercial NQ and NQOD panelboard installations.
How does the thermal-magnetic trip unit in the QOB115-1021 protect the circuit?
The thermal component provides a long-time delay to prevent nuisance tripping from temporary overloads, while the magnetic component delivers an instantaneous trip to quickly clear severe short circuits.
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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