HGW4 isolation switch

Disconnector, which refers to the insulation distance and clear disconnection mark between the contacts that meet the specified requirements when in the open position; A switch device that can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuit) within a specified time when in the closed position. (IEV441-14-05)。
Isolation switch (commonly known as "knife switch") generally refers to high-voltage isolation switch, which is an isolation switch with a rated voltage of 1kV or above, usually abbreviated as isolation switch. It is the most commonly used type of high-voltage switchgear. Its working principle and structure are relatively simple, but due to its large usage and high reliability requirements, it has a significant impact on the design, establishment, and safe operation of substations and power plants. The main characteristic of an isolation switch is that it has no arc extinguishing ability and can only open and close circuits without load current. Isolation switches are used for various voltage levels, to change circuit connections or isolate lines or equipment from power sources. They do not have the ability to cut off current and can only be operated after disconnecting the line with other devices. Generally equipped with interlocking devices to prevent accidental operation of switches under load, sometimes pins are needed to prevent the switch from disconnecting under the magnetic force of major faults.