The GN19-12C/630A series indoor high-voltage isolating switches are indoor devices with a rated voltage of 12 kV, applicable to three-phase alternating current systems at a frequency of 50 Hz.
a. The installation site should be free from gases, vapors, chemical deposits, salt spray, dust, dirt and other explosive or corrosive substances that can seriously affect the insulation and conductivity of the isolating switches.
b. The installation site should be free from frequent and intense vibrations.

