Working Conditions Of DC Circuit Breakers

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

2. The ambient air temperature is not higher than +40℃ and not lower than -5℃; and the 24-hour average value does not exceed +35℃ (except for special orders).

3. The relative humidity of the air at the installation site. The maximum temperature is not more than 50[%] at +40℃, and higher relative humidity is allowed at lower temperatures, for example, up to 90[%] at 2O℃. Special measures should be taken for the occasional condensation caused by dry temperature changes.

4. There is no explosive dangerous medium in the air, and there is no place where there is no gas and conductive dust that can corrode metal and damage the insulation.

5. A place free from rain and snow.

6. The pollution level is level 3.

7. Installation category: The installation category of the main circuit of the circuit breaker is Ⅲ, and the installation category of auxiliary circuits and control circuits that are not connected to the main circuit is Ⅱ.