Siemens QA120AF U Circuit Breaker

Siemens QA120AF U is a 20-amp, 1-pole Arc-Fault Circuit Interrupter (AFCI) plug-in circuit breaker designed for 120-volt residential branch circuits, delivering a 10,000-amp interrupting capacity (10kAIC) and built-in arc-fault protection to detect and interrupt dangerous arcing conditions. Part of Siemens' QAF2 family, QA120AF U provides long-time and instantaneous trip functions, protecting against arc faults while requiring no external accessories for installation in compatible Siemens panels. The unit is a plug-in style breaker with load-side lug terminals, enabling straightforward replacement in standard load centers. It is intended for residential circuits requiring AFCI protection in living areas and is compatible with other Q-Series breakers to form a code-compliant AFCI protection plan.