Why QA120AFC is specific: Siemens QA120AFC protects one 20-amp, 120-volt branch circuit with combination arc-fault detection. This pigtail-neutral construction is useful when the approved Siemens panel does not call for the newer plug-on-neutral version.
QA120AFC specifications
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Catalog number: QA120AFC
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Branch rating: 20A, 1-pole, 120VAC
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Protection: Combination AFCI plus thermal-magnetic overcurrent
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Interrupting capacity: 10kA
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Neutral style: Factory pigtail
AFCI is not GFCI
This model is intended to detect recognized series and parallel arcing conditions. It should not be represented as personnel-level ground-fault protection; where both functions are required, use an approved dual-function solution.
Siemens panel verification
Read the load-center label for the accepted breaker type and catalog family before purchase. Pigtail and plug-on-neutral models can share an amperage yet have different panel requirements. Confirm the branch conductor, neutral routing, fault-current rating, and current code requirements with a qualified electrician.