An isolating switch is a switch device primarily used for "isolating power, switch disconnection operations, and connecting or disconnecting low current circuits" without arc extinction capabilities. When in the open position, the switch contacts have an insulating distance and a clear disconnection mark that meet regulatory requirements; when 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 the specified time. Generally used as a high-voltage isolating switch, i.e., an isolating switch with a rated voltage above 1kV. Although its working principle and structure are relatively simple, its large usage volume and high reliability requirements have a significant impact on the design, establishment, and safe operation of substation and power plants. The main feature of the isolating switch is its lack of arc extinction capability, which allows for circuit opening and closing only when there is no load current. The entry describes the functions, features, types, applications, anti-misoperation improvements, maintenance, and common issues of isolating switches.