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Square D QOB120-1021 QOB1201021 - 20A 1 Pole Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Square D
QOB120-1021
QOB1201021 - 20A 1 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOB120-1021
Quantity
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Square D QOB1201021 - 20A 1 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOB1201021 - 20A 1 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB1201021 |
| Series | QOB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| 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, Handle Tie, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR, SWD, UL 489 |
| Approval | CSA, HACR, SWD, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated |
Sold out
Quantity
Square D QOB1201021 - 20A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB1201021-R |
| Series | QOB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| 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, Handle Tie, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR, SWD, UL 489 |
| Approval | CSA, HACR, SWD, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated |
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Description
Part of the QO family, the QOB120-1021 is a 20A, 1-pole miniature circuit breaker engineered for commercial and industrial applications. It delivers reliable thermal-magnetic protection for branch circuits. Designed with a pressure plate terminal, this unit mounts securely into NQ and NQOD panelboards. The bolt-on connection ensures a stable fit. A factory-installed 120/208/240V AC shunt trip enables remote tripping capabilities. Rated at 10kAIC, it includes a Visi-Trip visual indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB1201021 |
| Series | QOB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| 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, Handle Tie, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR, SWD, UL 489 |
| Approval | CSA, HACR, SWD, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated |
Product FAQs
7 answersWhich panelboards are compatible with the QOB120-1021 circuit breaker?
This bolt-on miniature breaker is specifically designed for use in Square D NQ and NQOD series commercial panelboards. It requires threaded bus connections and will not fit in standard QO plug-on load centers.
What does the -1021 suffix indicate in the catalog number?
The -1021 suffix specifies that the breaker includes a factory-installed 120/208/240V AC shunt trip. This allows the circuit to be opened from a remote location using an external control signal.
Can I use the QOB120-1021 to replace a standard QOB120 breaker?
While it fits the same panel space and offers identical overcurrent protection, the QOB120-1021 includes an integrated shunt trip for remote shut-off. If your application does not utilize external control wiring for remote tripping, a standard QOB120 is the appropriate replacement.
How does the integrated shunt trip function operate?
The built-in shunt trip opens the breaker contacts when an external control voltage is applied. This feature is typically wired to emergency stop buttons, fire alarms, or automated safety shutdown systems.
Why use a bolt-on breaker like the QOB series instead of a plug-on type?
Bolt-on breakers mechanically fasten to the panel bus with screws, providing a highly secure and vibration-resistant electrical connection. This structural stability makes them ideal for demanding commercial and industrial environments.
How can I quickly identify if this breaker has tripped?
This model features a Visi-Trip indicator that displays a highly visible red flag in the breaker window during a trip event. This allows personnel to quickly locate the faulted circuit without manually testing every breaker in the panel.
What type of trip mechanism does this miniature breaker use?
It relies on a fixed, non-interchangeable thermal-magnetic trip unit. This design provides a long-time delay for clearing standard overloads and an instantaneous trip function for rapid short-circuit protection.
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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