Square D QOB120HM Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Square D
QOB120HM
Miniature Circuit Breaker
Brand
Square D
SKU
QOB120HM
Quantity
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Square D QOB120HM - 20A 1 Pole Miniature Circuit Breaker
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Description
Designed to accommodate demanding startup currents, this single-pole 20A breaker utilizes a high magnetic trip setting to eliminate nuisance tripping on specialized commercial loads. The bolt-on configuration ensures a rigid, reliable connection within Square D NQ and NQOD panelboards. Alongside its elevated magnetic threshold, the unit carries standard SWD and HACR ratings, making it highly versatile for switching duty and HVAC equipment protection.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 20A |
| 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, Shunt Trip, Handle Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, HACR, RoHS |
| Approval | CSA, HACR, RoHS, UL |
| Temp Rating | 40C |
| Construction Features | High Magnetic, HACR Rated, SWD Rated, Visual Trip Indicator |
Product FAQs
5 answersWhat panelboards are compatible with the QOB120HM circuit breaker?
This bolt-on breaker is designed specifically for Square D NQ and NQOD series panelboards. It will not fit in standard QO residential load centers, which require plug-on style breakers.
What does the HM suffix mean in the QOB120HM part number?
The HM designates this as a High Magnetic circuit breaker. It is engineered to tolerate higher initial inrush currents without nuisance tripping, making it ideal for specific motor or lighting loads.
Can the QOB120HM be used in place of a standard QOB120?
Yes. It shares the exact same physical dimensions and bolt-on mounting as the standard QOB120, but offers the added benefit of a high magnetic trip curve for high inrush applications.
Is this breaker suitable for HVAC equipment or switching lighting loads?
Yes, it is HACR rated for use with heating, air conditioning, and refrigeration equipment. It is also Switching Duty (SWD) rated, meaning it can be used to manually switch 120V fluorescent lighting circuits.
Why use a bolt-on breaker instead of a plug-on breaker?
Bolt-on breakers like the QOB120HM secure directly to the panelboard bus with a screw. This provides a robust mechanical connection that resists vibration, making it the standard choice for commercial and industrial environments.
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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