The elevation of the installation site shall not exceed 2000m;

The relative humidity of the air at the installation site does not exceed 50% at the high temperature of +40℃, and can have a higher relative humidity at the lower temperature, such as 90% at 20℃. Special measures should be taken for occasional condensation due to temperature changes;

Pollution is 3;

The circuit breaker can withstand mechanical vibration with frequency of 2Hz~ 13.2Hz, displacement of ±1mm, frequency of 13.2Hz~100Hz and acceleration of ±0.7g through GB/T2 423.10 test.

The main circuit of the breaker is installed in category Ⅲ, and the other auxiliary circuits and control circuits are installed in category Ⅱ.