Designed to protect against overloads, short-circuits, class A ground faults and arc-faults. Compatible with QO load centers and CSED devices. Provides one single pole circuit in one space. This breaker provides over current protection and switching on AC systems. When a Homeline circuit breaker trips, the handle snaps to a midpoint position between "OFF" and "ON" to easily identify the tripped breaker. Learn about general NEC 2020 updates, contact your local building inspector for adoptions and details. Square D QO 20-amp 1-Pole Dual Function AFCI/GFCI Circuit Breaker | QO120DFC