Applicable standards: 1) National standard: B/T14048.1, GB14048.4, JB/T7122 2) National standard: IEC 60947-4-1 Normal working and installation conditions: 1) Ambient temperature: -5~40°C 2) Average temperature: ≤35°C in 24 hours 3) Relative humidity: ≤50%, at max. 20°C (≤90%) 4) Altitude: ≤2,000m 5) Class of pollution: Class 3 6) Places without fire, explosion, corrosion and serious shake 7) The inclined angle between the mounting surface and vertical surface: ≤15