GW4 Isolation Switch

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 an insulating 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 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 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. The main feature of an isolating switch is its lack of arc extinction capability, allowing 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.