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 the occasional condensation caused by temperature changes.

Pollution is 3;

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

The circuit breaker is suitable for electromagnetic environment A;

The circuit breaker shall be installed in a place where there is no danger of explosion, no conductive dust, no enough to corrode metal and damage edges;

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