10KV Three phase Three-phase AC Column Upper Switch

The contacts of the isolation switch are all exposed in the air and have obvious disconnection points. The isolation switch does not have an arc extinguishing device, so it cannot be used to cut off load current or short-circuit current. Otherwise, under high voltage, the disconnection point will generate a strong arc and it is difficult to extinguish it on its own. It may even cause arcing (phase to ground or phase to phase short circuit), burn equipment, and endanger personal safety, which is a serious accident called "pulling the isolation switch with load". Isolation switches can also be used to switch certain circuits to change the operation mode of the system.

Symbols for high voltage isolation switches:
1. In the commonly used text symbol comparison table for electrical equipment, the symbol of the isolation switch is QS. The electrical symbol symbol is specified in IEC61636-1, which is not an English abbreviation but a combination of letter meanings. Q represents the switching device of the SWITCHING DEVICE FOR POWER CIRCUIT power circuit, and S represents the switching device selector of the SWITCHING DEVICE FOR Control CIRCUIT SELECTOR control, memory, and signal circuits.
2. High voltage isolation switches are important switching devices in the electrical systems of power plants and substations, and are generally required to be used in conjunction with high voltage circuit breakers.
3. High voltage isolation switches are suitable for indoor devices with three-phase AC 50Hz and rated voltage of 12KV. They are used to connect, cut off, or convert circuits of high voltage equipment under voltage and load conditions.
4. Commonly used high voltage isolation switches include GN19-10 and GN19-10C, while similar old products include GN6-10 and GN8-10.

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