Sunco LED Downlights and Slims are compatible with AFCI/Arc-Fault Circuit Breakers. AFCI or AFI breakers detect parallel arcs. When/if an arc occurs between hot and neutral wires, the interrupter (breaker) will detect it and trip the breaker. It will also trip the breaker (de-energize the circuit) for anomalies that mimic arcing faults and downstream overloads.This has been used in new residential homes since 2002.Does not detect ground faults (See GFCI Breakers).