Siemens Q120DFN U Single Pole Circuit Breaker

Siemens Q120DFN U is a 1-pole, 120-volt, 20-amp circuit breaker that provides both arc-fault (AFCI) and ground-fault (GFCI) protection in a plug-on-neutral design, making it suitable for use on residential branch circuits. It is rated to interrupt up to 10 kA at 120 V, delivering reliable fault interruption for safety-critical circuits, and is designed to install in Siemens load centers as part of the Q-series family. This model is specified as a 1P dual-function device (AFCI/GFCI) with a plug-on neutral connection and is listed as UL Type QFGA2N, aligning with Siemens’ AFCI/GFCI offerings for 120 V, 20 A installations.