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Square D QOB1151021 Miniature Circuit Breaker
- 15A
- 1 Pole
- Bolt-On
Square D
QOB1151021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB1151021
Quantity
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Square D QOB1151021 - 15A 1 Pole Miniature Circuit Breaker
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Description
Designed for advanced control applications, the Square D QOB1151021 combines overcurrent protection with remote tripping capabilities. This 15A single-pole breaker features a rugged bolt-on design for stable connections. It installs into Square D NQ and NQOD panelboards, providing an ideal solution for facilities requiring maximum reliability and vibration resistance.Specifications
| Brand | Square D |
|---|---|
| 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 (Cu/Al) |
| 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, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (120/208/240VAC) |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, SWD, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, SWD Rated, Mercury Free, RoHS Compliant |
Product FAQs
8 answersWhat does the 1021 suffix mean in the QOB1151021 catalog number?
The 1021 suffix indicates that this circuit breaker includes a factory-installed 120/208/240VAC shunt trip accessory. This allows the breaker to be tripped remotely via a control signal.
Which panelboards are compatible with the QOB1151021 circuit breaker?
This breaker is designed specifically for installation in Square D NQ and NQOD series panelboards. It is not compatible with standard QO residential load centers, which require plug-on breakers.
How does the QOB1151021 connect to the panelboard bus?
It utilizes a bolt-on mounting connection. This provides a secure, vibration-resistant mechanical and electrical connection to the panelboard bus, which is typically required in commercial and industrial applications.
What wire sizes and materials are accepted by the terminals on this breaker?
The pressure plate terminals are rated to accept either copper or aluminum conductors ranging from 14 AWG to 8 AWG.
Can the QOB1151021 be used in direct current (DC) applications?
Yes, this thermal-magnetic breaker is rated for use on 48VDC systems, where it provides an interrupting rating of 5kAIC.
What is the difference between Square D QO and QOB circuit breakers?
The primary difference is the mounting style. QO breakers are plug-on, while QOB breakers feature a bolt-on design for commercial panelboards. They share the same internal thermal-magnetic trip mechanisms and physical footprint.
How does the shunt trip function operate on this breaker?
The factory-installed shunt trip allows for remote tripping of the breaker for safety or control purposes. When the specified voltage is applied to the shunt trip coil leads, it mechanically forces the breaker to open the circuit.
Are the trip settings adjustable on the QOB1151021?
No, this miniature circuit breaker features fixed thermal-magnetic trip settings for both long-time (overload) and instantaneous (short circuit) protection.
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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.