Siemens QA120AFC 20-Amp Single Pole Combination AFCI Breaker - 120V

Overview

Meet the Siemens QA120AFC, a 20-amp single-pole combination AFCI circuit breaker designed for 120-volt electrical panels. It protects downstream branch circuits from both high-energy parallel arcing and low-energy series arcing, helping reduce nuisance trips and improve fault visibility.

What sets a combination AFCI apart from a branch/feeder AFCI is its capability to detect series arcing faults, which can occur within cords, devices, and wiring endpoints. This feature works alongside parallel arcing detection to provide broader coverage across typical home and small business circuits. Note that this device is an AFCI breaker only; it does not include GFCI protection.

LED trip indicators and what they mean

Siemens adds LED indicators near the breaker handle that briefly illuminate after a trip, helping electricians and informed homeowners quickly diagnose the last-trip condition. The LEDs appear for 5 seconds each time the breaker is turned on, and they can remain visible for up to 30 days after the last trip, aiding ongoing fault analysis.

Key features at a glance

• Single pole, 20 Amp, Combination AFCI circuit breaker — protects downstream wiring from arc faults
• LED trip indicators for clear identification of last trip condition
• More wiring space: 1/4 inch additional bend room for easier terminations
• Same-angle lugs on both sides for consistent wiring layout
• 25 lb-in torque rating for secure mounting

Practical installation and use cases

In residential and light commercial settings, the QA120AFC helps provide arc fault protection while remaining easy to install due to the 1/4 inch extra bend space and the two lugs at the same angle. The plug-on design supports straightforward replacement for compatible panels, and the device is built to withstand typical mounting torque.

Why choose Siemens QA120AFC

Siemens combines reliability with user-focused design: clear LEDs, improved wiring space, and precise mounting geometry. These traits support electricians and homeowners who value safety, clear fault signaling, and tidy installations, without implying guaranteed outcomes.