Siemens QF120A is a 1-pole, 120V AC, 20A GFCI circuit breaker that plugs into Siemens Q-series load centers for residential or light commercial service. It provides Class A ground-fault protection with a fixed 5 mA trip threshold and a 10 kA interrupting rating (UL Type QPF2), helping guard against electric shock on circuits with potential ground faults. The device accepts copper conductors in the 14–10 AWG range and uses a plug-in mounting design for straightforward installation. Ideal for branch circuits that require reliable GFCI protection, the QF120A is a standard choice when a 20A, 120V GFCI breaker is needed in Siemens panels.
