An isolating switch is a switch device primarily used for "isolating power, switchgear operation, and connecting and disconnecting low-current circuits" without arc-extinguishing capabilities. When in the open position, the switch contacts have an insulated distance and a clear disconnection mark that meet regulatory requirements; in the closed position, it can carry the current under normal circuit conditions and the current under abnormal conditions (such as a short circuit) within specified time frames. Generally used as a high-voltage isolating switch, i.e., isolating switches with rated voltages above 1kV, they have a relatively simple working principle and structure. However, due to their high usage volume and the high reliability requirements, they significantly impact the design, establishment, and safe operation of transformer stations and power plants. The main characteristic of an isolating switch is its lack of arc-extinguishing capability, allowing for circuit opening and closing only under no-load current conditions. The entry describes the functions, features, types, applications, anti-misoperation improvements, maintenance, and common issues of isolating switches.