Square D QO120DF Dual Function Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Quantity
Square D QO120DF - 20A Dual Function Miniature Circuit Breaker
New
Quantity
Description
Part of the QO series, this 20-amp dual-function breaker combines combination arc-fault and ground-fault protection into a single-pole footprint. It operates at 120VAC and is designed for residential electrical systems. Equipped with a standard pigtail neutral wire, the device mounts into traditional QO load centers and NQ panelboards. The breaker delivers a 10 kAIC interrupting rating and includes the signature Visi-Trip indicator, providing comprehensive safety for kitchens and laundry rooms.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO120DF |
| Series | QO |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | QO |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 14-8 AWG (Cu/Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | Dual Function (AFCI/GFCI) |
|---|---|
| Available Options | Padlock Attachment |
| Accessories | Pigtail Neutral |
| Standards | CSA C22.2 No. 5, UL 1699, UL 489, UL 943, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Visual Trip Indicator, Time Saver Diagnostics, Mercury Free |
Product FAQs
9 answersWhat is the difference between the QO120DF and the QO120PDF?
The QO120DF features a pigtail neutral wire, making it compatible with legacy QO load centers that lack a plug-on neutral bus. The QO120PDF is the Plug-On Neutral (PON) version designed specifically for newer PON-ready panels.
What type of protection does a dual function circuit breaker provide?
A dual function breaker like the QO120DF combines Combination Arc Fault (CAFCI) protection to prevent electrical fires and Class A Ground Fault (GFCI, 6mA) protection to prevent electrical shock in a single device.
How do I troubleshoot a tripped QO120DF breaker?
This breaker includes Square D Time Saver Diagnostics. By using the purple push-to-test button and observing the trip behavior, electricians can identify whether the circuit tripped due to an arc fault, a ground fault, or a standard overload.
What is the recommended tightening torque for the wire terminals on this breaker?
The pressure plate terminals on the QO120DF should be tightened to 35.4 lb-in (4 N.m) for 14 to 8 AWG copper or aluminum conductors.
Can I install the QO120DF in a Square D Homeline panel?
No. QO series breakers have a different mounting footprint and are not interchangeable with Homeline panels. You must use a Homeline series dual function breaker for Homeline load centers.
Is the QO120DF rated for switching duty (SWD) and HVAC equipment?
Yes, this 20-amp breaker is SWD rated for switching 120V fluorescent lighting loads and is HACR rated for use with heating, air conditioning, and refrigeration equipment.
How do I know if the breaker has tripped without opening the panel door fully?
The QO120DF features the exclusive Visi-Trip indicator. When the breaker trips, a highly visible red flag appears in the indicator window, making it easy to spot the faulted circuit at a glance.
Does this breaker meet NEC requirements for kitchen and laundry circuits?
Yes. Because it provides both CAFCI and Class A GFCI protection, it satisfies National Electrical Code (NEC) requirements for 120V, 20A branch circuits where both arc fault and ground fault protection are mandated.
Where does the white pigtail wire connect during installation?
The coiled white pigtail wire must be connected directly to the neutral bus bar in the load center to power the internal AFCI and GFCI diagnostic circuitry of the breaker.
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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