SIEMENS
SIEMENS QA120AFC Arc Fault Circuit Breaker 20A 1 Pole 120V AC
Detects dangerous arc faults and interrupts 20 A single-phase circuits at 120 V AC with a 10 kA rating
- Combination arc-fault protection detects dangerous arcs
- 20 A rating supports standard branch circuits
- Single-pole 120 V AC design fits residential panels
- Plug-in mounting enables quick load-centre installation
- 10 kA interrupting rating handles high fault currents
Siemens QA Series Arc Fault Breaker
The Siemens QA120AFC is a combination arc fault circuit interrupter rated at 20 A for 120 V AC single-phase systems. It plugs directly into compatible Siemens single-phase load centers and protects branch circuits from both series and parallel arc faults. Electricians and homeowners use it to meet modern electrical code requirements for dwelling-unit circuits.
10 kA Interrupting Rating at 120 V AC
The breaker carries a maximum AIR rating of 10 kA at 120 V AC, which defines the highest prospective fault current it can safely interrupt. It is not rated for DC voltage applications and provides a single pole of protection only. Circuits requiring higher interrupting capacity or multi-pole protection need a different device.
Plug-In Mounting With 14–8 AWG Wire Range
Installation uses a plug-in mounting style that seats the breaker onto the load center bus without bolts. Terminals accept copper wire from 14 AWG up to 8 AWG and aluminium wire from 12 AWG up to 8 AWG. Common issues include inserting the breaker into an incompatible panel series, exceeding the listed wire sizes, or leaving the toggle actuator loose after wiring.
Highlights
- Combination arc-fault protection detects dangerous arcs
- 20 A rating supports standard branch circuits
- Single-pole 120 V AC design fits residential panels
- Plug-in mounting enables quick load-centre installation
- 10 kA interrupting rating handles high fault currents
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Should I pick the 20 A single-pole version or a different amperage for my Siemens load center?
Choose the 20 A single-pole QA breaker when the branch circuit is rated for 20 amps; other amperages protect different wire sizes and would not match this circuit.
What does the 10 kA interrupting rating mean once the breaker is installed in a panel?
It means the breaker can safely interrupt up to 10 000 amps of fault current at 120 V AC, protecting the panel and wiring during a short circuit.
Does the plug-in mounting work with any panel or only Siemens single-phase load centers?
The plug-in mounting is designed specifically for Siemens single-phase load centers; it will not latch correctly in other brands or three-phase panels.
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