Siemens Q120AFCNL U Circuit Breaker

The Siemens Q120AFCNL U is a 1-pole arc-fault circuit interrupter (AFCI) breaker rated for 120 V AC at 20 A, designed to protect individual residential branch circuits in Siemens load centers. This 1P 20A AFCI device provides combination-type protection to detect arcing faults and trip to prevent electrical fires, featuring a 10 kA interrupting rating at 120 V. It is intended for use in Siemens panels and other enclosures that accept single-pole AFCI breakers, making it suitable for circuits feeding lighting and general-use receptacles where arc-fault protection is required by code. The Q120AFCNL U variant aligns with Siemens’ AFCI family and is cataloged for 120 V, 20 A, 1-pole installations, providing reliable arc-fault protection in residential applications while maintaining compatibility with Siemens Q/QA-series distribution equipment.