Normal working conditions

• Ambient temperature: -5~+40℃, and average temperature in 24 hours below +35℃
  (except for special orders).
• Elevation of installation site: 2000m
• Relative humidity: not exceeding 50% at the maximum ambient temperature of +40℃.
• With lower temperature, higher humidity would be permitted, but the lowest average
  temperature in a month not exceeding 90% in that month, and giving consideration to
  the dews on the goods surface, which would appear due to temperature change.
• Pollution protection: 3 grade
• The breaker should be put in the place where there isn’t any explosive medium and
  conductive dust and no gas, which would corrode metal or destroy the insulation.