Siemens Q120DFN Dual Function Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Quantity
Siemens Q120DFN - 20A Dual Function Miniature Circuit Breaker
New
Quantity
Description
Engineered to streamline residential panel installations, the Q120DFN eliminates the traditional pigtail wire by utilizing a plug-on neutral connection. This 20-amp, single-pole breaker mounts into modern Siemens PON load centers, significantly reducing gutter clutter and installation time. It delivers 10kAIC protection at 120VAC while satisfying NEC mandates for both combination arc fault and 5mA ground fault safety in kitchens, bathrooms, and laundry areas.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q120DFN |
| Series | Q |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Plug-On Neutral Load Centers |
| Wire Gauge | 14-8 AWG (Cu), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| 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 | LED Trip Indicator |
| Standards | CSA C22.2, UL 489, UL 943, UL 1699 |
| Approval | CSA, HACR, SWD, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Insta-Wire, Self-Test, Visual Trip Indicator |
Product FAQs
6 answersWhat load centers are compatible with the Siemens Q120DFN circuit breaker?
The Q120DFN is designed exclusively for Siemens Plug-On Neutral load centers, such as the PN and SN series. It will not fit older legacy panels that require a pigtail neutral connection.
What is the difference between the Siemens Q120DFN and the Q120DF?
Both are 20A dual-function breakers, but they use different neutral connections. The Q120DFN features a plug-on neutral design that connects directly to the panel neutral bar, eliminating the pigtail wire. The Q120DF includes a standard pigtail wire for use in legacy panels without a plug-on neutral rail.
What type of protection does a dual-function circuit breaker provide?
A dual-function breaker like the Q120DFN combines Combination Type Arc-Fault Circuit Interrupter (AFCI) protection and Class A 5mA Ground-Fault Circuit Interrupter (GFCI) protection into a single device. This meets NEC requirements for areas like kitchens and laundry rooms that need both arc-fault and ground-fault safety.
How do I connect the neutral wire to the Q120DFN?
Because the Q120DFN is a plug-on neutral breaker, the branch circuit neutral conductor terminates directly at the breaker load lug. The breaker itself connects to the panel neutral rail via a mounting clip, so there is no coiled pigtail wire to route.
What is the GFCI class rating for the Q120DFN?
The Q120DFN features Class A GFCI protection, which is designed to trip when a ground fault of 5mA is detected, providing personnel protection against electrical shock.
Does the Siemens Q120DFN include a self-test feature?
Yes, this breaker includes an automated self-test feature to routinely verify that the AFCI and GFCI protection circuits are functioning correctly.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 47 reviews.
- CGCrocefissa G.Verified BuyerReviewingSiemens Q115 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Quick delivery and great price.
The circuit breakers are at a great cost.
- JBJason B.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Great experience
The product was exactly what I needed and it arrived on time.
- DQDon Q.Verified BuyerReviewingSiemens Q3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/14/26Siemens breaker
Great customer experience, great prices and fast shipping... Definitely will be buying her again.
- CSChristopher S.Verified BuyerRated 5 out of 5 stars8/12/26Siemens 60
Perfect new condition
- GSGeorge S.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/4/26Great service
Every time I call or go online you have the parts I'm looking for.