An isolating switch is a switch device mainly used for "isolation of power, switching operations, and connection or disconnection of low current circuits" without arc-suppression capabilities. When in the open position, the switch has an insulating distance between contacts that meets specified requirements and a clear open indication; 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 a specified time. Generally used as a high-voltage isolating switch, i.e., an isolating switch with an rated voltage above 1kV. Its working principle and structure are relatively simple, but due to its high usage volume and stringent reliability requirements, it significantly impacts the design, establishment, and safe operation of substation and power plants. The main feature of an isolating switch is its lack of arc-suppression capability; it can only open or close the circuit under no-load current conditions. The entry covers the functions, features, types, applications, anti-misoperation improvements, maintenance, and common issues of isolating switches.