Square D QO2151021 Miniature Circuit Breaker
- 15A
- 2 Pole
- Plug-On
Square D
QO2151021
Miniature Circuit Breaker
Brand
Square D
SKU
QO2151021
Quantity
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Square D QO2151021 - 15A 2 Pole Miniature Circuit Breaker
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Description
Designed for remote tripping, this 15A, two-pole miniature circuit breaker includes a factory-installed shunt trip. It provides thermal-magnetic protection for 120/240VAC systems. The breaker mounts into Square D QO load centers and NQ panelboards. Due to the side-mounted shunt trip, this plug-on device requires three panel spaces. Rated at 10 kAIC, it features a Visi-Trip indicator for quick troubleshooting. The HACR-rated unit accepts 14-8 AWG wire.Specifications
| Brand | Square D |
|---|---|
| Series | QO |
| Amperage | 15A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QO |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | QO Load Centers, 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, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
8 answersCan I install the QO2151021 in a Square D Homeline load center?
No. QO series breakers, including the QO2151021, have a specific plug-on mounting clip that is not compatible with Homeline panels. It is designed exclusively for QO load centers, NQ panelboards, and NQOD panelboards.
What does the 1021 suffix mean for this QO circuit breaker?
The 1021 suffix indicates that this breaker comes with a factory-installed AC shunt trip. This accessory allows the breaker to be tripped remotely using a 120V, 208V, or 240V AC control signal.
How many panel spaces does the QO2151021 require?
This unit requires three standard 3/4-inch spaces in your panel. The 2-pole breaker occupies two spaces, and the factory-installed shunt trip accessory requires one additional space.
How do I wire the shunt trip on the QO2151021?
The factory-installed shunt trip module has two pigtail wires. To wire it, connect one lead to the neutral of your control power source, and the other lead to the normally open contact of your remote activation device, such as an emergency stop button or fire alarm relay. When the contact closes, it sends a 120V to 240V AC signal to the coil, tripping the breaker.
How do I reset the QO2151021 after the shunt trip has been activated?
Once the remote control signal is removed and the fault is cleared, you can reset the breaker manually. Push the breaker handle firmly to the OFF position, then push it back to the ON position.
Does this breaker provide GFCI or AFCI protection?
No. The QO2151021 is a standard thermal-magnetic breaker with a shunt trip. It provides standard overload and short-circuit protection but does not include Ground Fault (GFCI) or Arc Fault (AFCI) capabilities.
Does the QO2151021 feature a Visi-Trip indicator?
Yes. Like most standard QO breakers, it includes Square D's Visi-Trip indicator. When the breaker trips, either from an overcurrent event or via the remote shunt trip, a red indicator appears in the breaker window to easily identify the tripped circuit.
What is the difference between the QO215 and the QO2151021?
The QO215 is the standard 2-pole, 15A circuit breaker. The QO2151021 is the exact same breaker but includes a factory-installed 120/208/240V AC shunt trip accessory, which adds one extra pole space to its overall width.
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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