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Square D QO120-1021 QO1201021 - 20A 1 Pole Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Square D
QO120-1021
QO1201021 - 20A 1 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QO120-1021
Quantity
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Square D QO1201021 - 20A 1 Pole Miniature Circuit Breaker
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Description
Engineered for commercial and industrial electrical systems, this 20-amp single-pole miniature circuit breaker delivers reliable overcurrent protection. Featuring a plug-on mounting style, it installs into Square D QO load centers and NQ panelboards. This model includes a factory-installed 120/208/240VAC shunt trip accessory, which requires two total panel spaces for installation. It also features the signature Visi-Trip indicator for quick identification of tripped circuits.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO120-1021 |
| Series | QO |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Terminal Type | Pressure Plate |
|---|---|
| For Use With | QO Load Centers, NQ 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 | Shunt Trip |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, SWD, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated |
Product FAQs
7 answersWhat does the 1021 suffix indicate on the Square D QO1201021 circuit breaker?
The 1021 suffix indicates that this breaker includes a factory-installed 120/208/240V AC shunt trip accessory. This allows the breaker to be tripped remotely by an external voltage signal.
How many panel spaces does the QO1201021 require for installation?
This breaker requires two full panel spaces. One space is for the 20-amp single-pole breaker, and the second space is for the factory-installed shunt trip accessory.
Which load centers and panelboards are compatible with the QO1201021 breaker?
This plug-on circuit breaker is designed for use in Square D QO load centers, NQ panelboards, and NQOD panelboards. It connects directly to the bus bar without requiring DIN rail or bolts.
What is the primary safety application for the shunt trip on this breaker?
The shunt trip allows the breaker to be opened remotely by an external electrical signal. This is commonly used for emergency stops, fire alarm system tie-ins, or equipment shutdowns to ensure safety during a fault or emergency.
Does this breaker feature a tripped circuit indicator?
Yes, it includes the Square D Visi-Trip indicator. When the breaker trips, a highly visible red indicator appears in the window, making it easy to identify the tripped circuit inside a dark or crowded panel.
Is the QO1201021 rated for HVAC equipment and switching applications?
Yes, this breaker 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 switch 120V fluorescent lighting loads on and off on a regular basis.
Are there any alternate part numbers for this breaker?
This breaker is commonly listed as QO120-1021 or QO1201021. The base breaker is a standard QO120, but the -1021 suffix is critical as it denotes the factory-installed shunt trip.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 285 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 6/13/26
Customers say these circuit breakers arrive quickly and work as described. Fast shipping and competitive pricing are frequently mentioned, with many noting same-day or next-day delivery. Users appreciate the wide inventory, particularly for hard-to-find older-style models unavailable locally. The products function reliably and arrive in good condition. Most customers report straightforward ordering and positive interactions. However, some experienced delivery delays or received incorrect items requiring reordering. A few noted concerns about condition upon arrival or customer service responsiveness.
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Rating
285 reviews
- GCGerard C.Verified BuyerReviewingSquare D QO130GFI - 30A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/21/26Great !
I could not find the breaker in hardwood stores. Superbreakers took car of it in a week.
- RHRoy H.Verified BuyerReviewingSquare D QO280 - 80A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/17/26Square D QO280 - 80A 2 Pole Miniature Circuit Breaker
Exactly as described
- KWKevin W.Verified BuyerReviewingSquare D QO120 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/15/26Great Price
Brand spanking new!
- CEchristopher e.Verified BuyerReviewingSquare D QO115PDF - 15A Dual Function Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26My breakers
Had a hard time locating these breakers locally, when I did find 1 they wanted to charge me triple what superbreakers charged. Items delivered exactly when they said they would, were exactly what I ordered. Appreciated the ease of ordering, definitely my go to from this point on
- JCJerry C.Verified BuyerReviewingSquare D QO250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/8/26Great quality
No issues