The KYN28-12 armored AC metal enclosed switch device (hereinafter referred to as switch cabinet) is the indoor complete power distribution device with the three-phase AC 50Hz single bus-bar and double bus-bar segmented systems; it is applied to the power grid with rated voltage 3～10kV in the power plants, transformer stations and industrial and mining enterprises to accept and distribute the electric energies and control, protect and monitor the electric circuits. 

This switch cabinet device satisfies: the standard requirements such as IEC298 AC Metal Enclosed Switch Device and Control Unit with Rated Voltage from 1kV and Above to 52kV and Below, GB3906 3-35kV AC Metal Enclosed Switch Device, GB/T11022 Common Technical Requirements for High-voltage Switch Device and Control Unit Standards and DL/T404 Technical Conditions for Order of Indoor AC High-voltage Switch Cabinet, it also meets the “Five Preventions” as well as the full working condition, totally-enclosed and all-insulated conditions. 

1. Ambient temperature +40oC~-15oC

2. Altitude: Not higher than 2000m, (It can be produced after consulting with the technical department of our company in case of higher than 2000m)

3. Relative humidity:

Average daily relative humidity≦95%; 

Average daily water vapor pressure≦2.2kpa;

Average daily relative humidity≦90%;

Average daily water vapor pressure≦1.8kpa. 

4. Earthquake intensity: not above M8.0

5. Places without fires, explosion hazards, heavy pollutions, chemical corrosions and strenuous vibrations etc.