Siemens QA120AF AFCI Miniature Circuit Breaker

Yes, Siemens Q-frame breakers like the QA120AF are backwards compatible and UL listed for use in older ITE load centers that accept QP type breakers. It also fits modern Siemens EQ, PL, ES, and Ultimate load centers.

Yes, the QA120AF serves as a direct drop-in replacement for legacy Siemens and ITE Q120AF branch/feeder arc fault models.

No, the QA120AF features a standard pigtail neutral connection. The coiled white wire must be connected directly to the neutral bus bar in the panel, meaning it does not require a specialized plug-on neutral load center.

The QA120AF is a Branch/Feeder AFCI, meaning it is designed to detect parallel arcing faults (line-to-ground and line-to-neutral). It is typically used to maintain older systems, whereas modern electrical codes often require Combination AFCI (CAFCI) breakers like the QA120AFC.

Yes, the QA120AF features lugs that are rated for both copper and aluminum wiring. It accepts 14 to 8 AWG copper wire or 12 to 8 AWG aluminum wire.

The LI designation means the breaker provides Long-Time and Instantaneous trip functions. The long-time function protects against sustained overloads, while the instantaneous function trips immediately in the event of a severe short circuit.

Yes, the QA120AF is equipped with an LED trip indicator to help electricians and homeowners quickly identify the cause of a fault when the breaker trips.

While a standard breaker only provides thermal-magnetic protection against overloads and short circuits, the QA120AF also includes electronic circuitry to detect dangerous parallel arc faults, helping to prevent electrical fires.