An AC Disconnect Switch—also known as a solar isolator switch—is a crucial component in any grid-tied or hybrid solar PV system. It serves as a manual shutoff device that disconnects the alternating current (AC) coming from the solar inverter to the load or utility grid. This switch is usually mounted outdoors (near the meter or inverter) and is often required by local electrical codes to ensure that utility workers and technicians can safely isolate the system during maintenance or emergencies.