Square D QOB115HM Miniature Circuit Breaker
- 15A
- 1 Pole
- Bolt-On
Square D
QOB115HM
Miniature Circuit Breaker
Brand
Square D
SKU
QOB115HM
Quantity
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Square D QOB115HM - 15A 1 Pole Miniature Circuit Breaker
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Description
Featuring a high-magnetic trip threshold, this 15-amp bolt-on breaker is engineered to tolerate significant inrush currents without nuisance tripping. It is an ideal solution for specialized commercial and industrial loads that draw heavy power upon startup. This unit fastens securely into Square D NQ and NQOD panelboards, utilizing a robust bolt-on connection for maximum reliability in demanding environments. It accepts 14-8 AWG wire sizes through standard pressure plate terminals.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 15A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| 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 | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, HACR, SWD |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High-Magnetic, HACR Rated, SWD Rated, Visual Trip Indicator |
Product FAQs
7 answersWhich panelboards accept the Square D QOB115HM circuit breaker?
The QOB115HM is a bolt-on miniature circuit breaker designed exclusively for Square D NQ and NQOD series panelboards. It will not fit in standard QO plug-on load centers.
What does the HM suffix mean on this Square D breaker?
The HM suffix stands for High Magnetic. This indicates the breaker has a higher magnetic trip threshold to prevent nuisance tripping when starting loads with high initial inrush currents, such as motors or High Intensity Discharge (HID) lighting.
Is the QOB115HM suitable for switching lighting loads and HVAC equipment?
Yes, this breaker is SWD (Switching Duty) rated for switching 120VAC fluorescent lighting loads. It also carries an HACR rating for use with heating, air conditioning, and refrigeration equipment.
Can the QOB115HM be used in DC applications?
Yes, in addition to its AC ratings, this breaker is rated for use in 48VDC systems. This makes it suitable for specific low-voltage control circuits and battery applications.
How should wire be terminated on the QOB115HM?
The breaker features pressure plate terminals that accommodate 14 AWG to 8 AWG copper or aluminum conductors. Always ensure the terminal screw is torqued to the manufacturer specifications printed on the breaker to prevent arcing.
What is the advantage of the bolt-on mounting style for this breaker?
The bolt-on connection secures the breaker directly to the panelboard busbar with a screw. This provides a highly stable, vibration-resistant mechanical and electrical connection commonly required in commercial and industrial applications.
Can a standard QO plug-on breaker be used in place of the QOB115HM?
No. While standard QO breakers share the same internal mechanisms and trip characteristics, NQ and NQOD panelboards require the bolt-on mounting of the QOB frame to properly secure to the busbar.
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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