An isolating switch is a switch device primarily used for "isolating power, switching operations, and connecting or disconnecting low-current circuits" without arc-suppression capabilities. When in the open position, the isolating switch has an insulated distance between contacts that meets regulatory requirements and clear disconnecting marks; in the closed position, it is capable of carrying the current under normal circuit conditions and abnormal conditions (such as a short circuit) within specified timeframes. Generally used as a high-voltage isolating switch, i.e., an isolating switch with a rated voltage of 1kV or more, its working principle and structure are relatively simple. However, due to its high usage volume and stringent reliability requirements, it has a significant impact on the design, establishment, and safe operation of substation and power plant facilities. The main feature of the isolating switch is its lack of arc-suppression ability, allowing circuit opening and closing only when there is no load current. The entry covers the function, features, types, applications, anti-misoperation improvements, maintenance, and common issues of isolating switches.