Circuit breaker working conditions

Ambient air temperature: The upper limit of ambient air temperature is +40℃; The lower limit of ambient air temperature is -5℃; The average value of ambient air temperature for 24 hours does not exceed +35℃.
Altitude: The altitude of the installation site does not exceed 2000m.
Atmospheric conditions: The relative humidity of the atmosphere does not exceed 50% when the ambient air temperature is +40℃; higher relative humidity can be achieved at lower temperatures; The average maximum relative humidity of the wettest month is 90%, and the average minimum temperature of the month is +25℃, taking into account the condensation on the product surface due to temperature changes.
Pollution level: The pollution level is level 3.
Control circuit:
1. It should be able to monitor the integrity of the control circuit protection device and its tripping and closing circuits to ensure the normal operation of the circuit breaker;
2. It should be able to indicate the normal closing and opening position status of the circuit breaker, and have obvious indication signals during automatic closing and automatic tripping;
3. After closing and tripping, the command pulse should be released, that is, the power supply for closing or tripping can be cut off;
4. When there is no mechanical anti-tripping device, an electrical anti-tripping device should be installed;
5. The accident tripping signal circuit of the circuit breaker should be wired according to the "non-corresponding principle";
6. For equipment that may have abnormal working conditions or failures, a warning signal should be installed;
7. The power supply of the spring operating mechanism and the manual operating mechanism can be DC or AC, and the power supply of the electromagnetic operating mechanism requires DC.