QO single-pole plug-on neutral CAFCI (combination arc-fault circuit interrupting) circuit breaker. Ideal for use to help protect your wires from arcing faults and is intended for overload and short-circuit protection of your electrical system. Designed for reliability, connects directly to the neutral bar, providing a time and labor-saving installation. Also provides several advantages such as fewer connections which lead to faster installation, and an innovative neutral jaw eliminates pigtails which in turn frees gutter space. Time-Saver Diagnostics provide advanced trip indication technology, helping identify the type of fault that has occurred faster. Time-Saver Diagnostics helps take away the guess work and provides diagnostic assistance by identifying the type of fault that last occurred. It saves money by reducing troubleshooting time, simple to use, accurate and reliable. QO circuit breakers have features no other manufacturer can offer.