Siemens Q120DFN AFCI GFCI Dual Function Circuit Breaker

Siemens Q120DFN is a 1-pole, 20 A, 120 V AFCI/GFCI dual-function circuit breaker with plug-on neutral connection, designed to protect a single branch circuit in residential load centers by combining arc-fault and ground-fault protection in one device. It integrates a combination-type AFCI with a 5 mA ground-fault trip threshold and an interrupting rating of 10 kAIC at 120 V, delivering robust protection against arc faults and ground leakage on circuits such as living rooms, bedrooms, and kitchens. The Q120DFN is UL-listed as type QFGA2N (Plug-On Neutral) and is intended for Siemens plug-on neutral panels or compatible Siemens breakers, simplifying installation in compatible distribution boards. This 1-pole 120 V circuit breaker is commonly used on branch circuits for outlets and lighting where AFCI/GFCI protection is advised, providing early arcing fault detection and leak protection in a compact, single-unit form factor.