We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Siemens QA series arc fault breaker toggle plug-in white 2.6 by 3.1 inches

SIEMENS

SIEMENS QA120AFC Arc Fault Circuit Breaker 20A 1 Pole 120V AC

SKU CH-MS5V-5033W

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.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $54.99
Typical for this category: the median of 1,135 items is $54.99.

Specifications

Product
Brand nameSIEMENS

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.

More in Breakers & Circuit Protection

Similar items