Overview
The Siemens Q120DFN is a 20 amp, 120 volt, single-pole Type QFGA2N dual-function circuit breaker for compatible Siemens plug-on-neutral load centers. It combines combination AFCI, Class A GFCI, and thermal-magnetic overcurrent protection in one device with a 10 kA interrupting rating.
Key Features
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Dual-function protection: Provides both arc-fault and ground-fault protection while retaining conventional overload and short-circuit protection.
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Plug-on-neutral installation: Connects directly to the neutral rail in a compatible Siemens plug-on-neutral load center, eliminating the breaker neutral pigtail.
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Load connection: Branch conductors terminate at the breaker box lug.
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Standards: UL 489, UL 1699, and UL 943 references; CSA, HACR, and SWD rated.
Specifications
- Manufacturer part number: Q120DFN
- Series / type: QFGA2N dual function, plug-on neutral
- Current rating: 20 A
- Voltage rating: 120 V AC
- Poles / phase: 1 pole / 1 phase
- Protection: combination AFCI, Class A GFCI, thermal-magnetic
- Interrupting rating: 10 kA
- Mounting: plug-in, plug-on neutral
- Load terminal: box lug
- Conductor range: 14–8 AWG copper; 12–8 AWG aluminum
- Temperature calibration: 40°C
Common Applications
- 20 A dwelling-unit branch circuits requiring both AFCI and GFCI protection.
- Kitchens, laundry areas, basements, garages, and similar circuits when the installation requires dual-function protection.
- Compatible Siemens plug-on-neutral load centers listed for Type QFGA2N breakers.
- Exact-catalog replacement for Siemens Q120DFN.
