Square D QO115-1021 QO1151021 - 15A 1 Pole Miniature Circuit Breaker
- 15A
- 1 Pole
- Plug-On
Quantity
Square D QO1151021 - 15A 1 Pole Miniature Circuit Breaker
New
Quantity
Description
Built specifically for commercial and industrial control systems, this 15-amp breaker includes a factory-installed shunt trip mechanism. The accessory allows for remote tripping via an external voltage signal, making it ideal for emergency stops. It fits standard Square D QO load centers and NQ panelboards using a standard plug-on mount. Along with remote capabilities, it retains the standard Visi-Trip indicator and HACR rating for HVAC use.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO115-1021 |
| Series | QO |
| Amperage | 15A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| 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 | HACR, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated |
Product FAQs
8 answersWhat panels are compatible with the Square D QO115-1021 circuit breaker?
This plug-on breaker is designed for use in Square D QO load centers and NQ panelboards. It is not compatible with Homeline or QOB bolt-on panels.
What does the -1021 suffix mean on the QO115-1021 breaker?
The -1021 suffix indicates that this breaker includes a factory-installed 120/240VAC shunt trip mechanism. This accessory allows the breaker to be tripped remotely via an external voltage signal, which is commonly used for emergency stops or automated control systems.
How is the shunt trip wired on the QO115-1021?
The factory-installed shunt trip requires an external 120/240VAC control signal to operate. When voltage is applied to the shunt trip coil leads, it mechanically trips the breaker to open the circuit.
Can I install the QO115-1021 in a Square D Homeline load center?
No. Square D QO breakers have a specific plug-on mounting clip that is not interchangeable with Homeline (HOM) load centers. You must use a QO load center or NQ panelboard.
Is the QO115-1021 the same as a standard QO115 breaker?
No. While both are 15-amp, single-pole breakers, the QO115-1021 includes a factory-installed shunt trip for remote tripping capabilities. A standard QO115 does not have this feature.
Does the QO115-1021 feature a Visi-Trip indicator?
Yes, like standard QO breakers, this model includes the Visi-Trip indicator. When the breaker trips, either from an overcurrent event or via the shunt trip mechanism, a red indicator window appears to help easily identify the tripped breaker in the panel.
Can the shunt trip on the QO115-1021 be used for continuous control?
No. The shunt trip mechanism is designed for momentary voltage pulses to trip the breaker during emergencies or specific control events. Applying continuous voltage to the shunt trip coil can burn it out.
How many panel spaces does the QO115-1021 require?
This breaker requires two standard 3/4-inch spaces in a QO load center or NQ panelboard. One space is for the 15-amp breaker pole, and the second space houses the factory-installed shunt trip module.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 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