An isolating switch is a switch device primarily used for "isolating power, switching operations, and connecting or disconnecting low current circuits" without arc extinction capabilities. When in the open position, the switch contacts have a specified insulating distance and clear disconnecting marks. In the closed position, it can carry the current under normal circuit conditions and abnormal conditions (such as a short circuit) within a specified time. Generally used as a high-voltage isolating switch, i.e., isolating switches with rated voltages above 1kV. Although its working principle and structure are relatively simple, due to the high volume of use and the requirement for high operational reliability, it has a significant impact on the design, establishment, and safe operation of substation and power plant. The main feature of the isolating switch is its lack of arc extinction ability, which can only disconnect or connect circuits under no load current. The entry describes the functions, features, types, applications, anti-misoperation improvements, maintenance, and common issues of isolating switches.