The Siemens Q120DF delivers dual function protection by combining AFCI and GFCI safety in one 20-amp breaker, covering two code-driven protection needs in a single panel space. That makes it a strong fit for NEC 2020 kitchen and laundry circuits that require both arc-fault and ground-fault protection, and for remodels where homeowners want one breaker instead of separate AFCI and GFCI devices. Its self-test design verifies protection electronics, while the breaker also provides 5 mA GFCI response and combination AFCI detection for a wider range of arc signatures. It is built for compatible Siemens and Murray panels and carries a Lifetime Limited warranty.
When would I need a 20-amp dual function breaker like the Q120DF?
A 20-amp dual function breaker is commonly used on 120V branch circuits where code or project requirements call for both AFCI and GFCI protection together. NEC 2020 has expanded these requirements in spaces such as kitchens and laundry areas, so one breaker can satisfy both protection needs at the panel.
Is one Q120DF enough, or do I still need a separate GFCI receptacle?
In many applications, the Q120DF can provide the required branch-circuit AFCI and GFCI protection without needing a separate GFCI device downstream. Whether you still choose a GFCI receptacle can depend on design preference, local inspection practice, and whether you want local test/reset access at the outlet.
Why does Siemens specify combination type AFCI on this breaker?
Combination type AFCI means the breaker is designed to detect more than one category of hazardous arcing, including both parallel and series faults. That gives broader protection than older branch-feeder-only AFCI designs, which were less capable at identifying certain real-world arc conditions in connected wiring and cords.
How do I know if the Q120DF is compatible with my panel?
This breaker is intended for Siemens ES, EQ, PL, E, P, W, HW, HPW, G, HG, SGF, SN, XG, and OG series load centers, as well as Murray panels. Check the panel directory or labeling for listed compatible breaker types before installing, because panel listing always controls final compatibility.
# Siemens 20 Amp Single Pole Dual Function AFCI/GFCI Circuit Breaker, Self-Test (Q120DF) **Model:** `Q120DF` **Brand:** Siemens **Category:** Circuit Breaker > The Siemens Q120DF delivers dual function protection by combining AFCI and GFCI safety in one 20-amp breaker, covering two code-driven protection needs in a single panel space. That makes it a strong fit for NEC 2020 kitchen and laundry circuits that require both arc-fault and ground-fault protection, and for remodels where homeowners want one breaker instead of separate AFCI and GFCI devices. Its self-test design verifies protection electronics, while the breaker also provides 5 mA GFCI response and combination AFCI detection for a wider range of arc signatures. It is built for compatible Siemens and Murray panels and carries a Lifetime Limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | Circuit Breaker | | Poles | 1 | | Amperage | 20 | | Voltage Vac | 120 | | Interrupt Rating Ka | 10 | | Trip Type | Thermal-Magnetic, AFCI, GFCI | | Afci Protection | Yes | | Gfci Protection | Yes | | Self Test | Yes | | Plug On Neutral | No | | Wire Gauge Awg | 14-10 | | Compatible Panels | Siemens ES, EQ, PL, E, P, W, HW, HPW, G, HG, SGF, SN, XG, OG series; Murray panels | | Certifications | UL 489, UL 1699, UL 943 | | Warranty | Lifetime Limited | ## What's Included - (1) Siemens Q120DF Dual Function AFCI/GFCI Circuit Breaker Source: https://www.jaspecs.com/siemens/circuit-breaker/q120df-siemens-dual-function-afci-gfci-breaker-20a/