Ⅰ. Ambient air temperature of -5℃ ~ +40℃.

Ⅱ. The altitude of the installation site does not exceed 2000m.

Ⅲ. The relative humidity of the air at the installation site does not exceed 50% at a maximum temperature of +40°C. Higher relative humidity is possible at lower temperatures, e.g. up to 90% at 20°C. Special measures shall be taken for occasional condensation due to temperature changes.

Ⅳ. A pollution class of 3.

Ⅴ. The circuit breaker is required by test IEC60947-2 to withstand mechanical vibration with a frequency of 2 Hz to 13.2 Hz, displacement of ±1 mm and a frequency of 13.2 Hz to 100 Hz and acceleration of ±0.7 g.

Ⅵ. The installation category of the main circuit of the circuit breaker is Ⅲ, and the installation category of the remaining auxiliary circuits and control circuits is Ⅱ.

Ⅶ. The circuit breaker is suitable for electromagnetic environment A.

Ⅷ. The circuit breaker of the damp heat belt type (TH type) passes the test requirements of IEC60947-2 and GB/T2423.18 and can withstand the influence of humid air, salt spray, oil mist and mould.

Ⅸ. The circuit breaker shall be installed in a place free from explosion hazards and conductive dust, and free from places sufficient to corrode metal and destroy insulation

Ⅹ. The circuit breaker shall be installed in a place free from rain or snow.

Ⅺ. Storage conditions: ambient air temperature of -25℃ ~ +70℃.

Capacity reduction factor for ambient temperature variation

Variation of ambient air temperature on decoupling characteristics, corrected as shown in Table

Capacity reduction factor of breaker altitude

Note: When the temperature is lower than 50℃, capacity reduction is not considered.

When the ambient temperature is 40℃ at an altitude greater than 2000m, the decoupling characteristics will change considering the insulation characteristics and cooling capacity of air and should be corrected, see table.