الوصف

For non-coal mines underground substations, 6(7.2)kV or *0(*2)kV voltage, **0A or ***0A currency. This switch also applies to high buildings, factories, metallurgy, chemical and substations.
1. the altitude is less than ***0m
2. ambient temperature is from *5℃ to *0℃
3. relative humidity is less than *5% (at *5℃)
4. without fire, explosion, serious pollution, chemical corrosion and violent vibration
5. allow storage at **0℃