Ships Same Day!
Ships Same Day!
Ships Same Day!
Ships Same Day!
Square D QOB120 Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Square D
QOB120
Miniature Circuit Breaker
Brand
Square D
SKU
QOB120
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D QOB120 - 20A 1 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOB120 - 20A 1 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB120 |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, SWD, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated |
Quantity
Square D QOB120 - 20A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB120-R |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, SWD, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated |
Similar Items
20A 1 Pole Miniature Circuit Breaker
20A 1 Pole Miniature Circuit Breaker
QOB1201021 - 20A 1 Pole Miniature Circuit Breaker
Description
Designed for reliable power distribution, the Square D QOB120 is a 1-pole, 20A miniature circuit breaker. It delivers standard thermal-magnetic protection for commercial facilities, safeguarding branch circuits from overcurrents. This unit mounts securely into Square D NQ and NQOD panelboards using a bolt-on connection. It accepts 14-8 AWG wire sizes via pressure plate terminals. Rated for 10 kAIC at 120/240V, it is SWD rated for switching lighting loads and includes a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB120 |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, SWD, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated |
Product FAQs
6 answersCan I install the QOB120 in a standard Square D QO residential load center?
No. The QOB120 features a bolt-on mounting design intended exclusively for Square D NQ and NQOD commercial panelboards. Standard QO load centers require plug-on circuit breakers.
What is the physical difference between the QO120 and QOB120 circuit breakers?
The internal thermal-magnetic trip mechanisms and electrical ratings are identical. The difference is the mounting connection. The QO120 is a plug-on breaker for load centers, while the QOB120 is a bolt-on breaker designed to secure directly to the bus bar in NQ and NQOD panelboards.
Is the QOB120 circuit breaker rated for switching lighting and HVAC loads?
Yes. The QOB120 carries both SWD (Switching Duty) and HACR (Heating, Air Conditioning, and Refrigeration) ratings. The SWD rating allows the breaker to safely act as a regular manual switch for 120V fluorescent lighting loads without causing premature mechanical wear.
Can I use the standard QOB120 for high-intensity discharge lighting circuits?
No. While it is SWD rated for standard fluorescent lighting, high-intensity discharge (HID) lighting circuits require a specialized breaker. You must source the QOB120HID variant specifically for HID applications.
How does the QOB120 connect to the panelboard bus?
The breaker fastens directly to the interior bus bar of compatible NQ and NQOD panelboards. This bolt-on connection ensures a secure, vibration-resistant mount mandated in many commercial and industrial electrical environments.
How does the QOB120 visually indicate a tripped circuit condition?
The QOB120 includes the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or short circuit, a bright red flag appears in a window next to the toggle handle, allowing rapid identification of the faulted circuit without manually testing every breaker.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
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.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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.
Search
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