Circuit Breaker Operating Conditions

Ambient air temperature: upper limit of ambient air temperature +40℃; ○lower limit of ambient air temperature -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°C; it can have higher relative humidity at lower temperatures; the monthly average maximum relative humidity of the wettest month is 90%, and the monthly average relative humidity of that month is 90%. The monthly average minimum temperature is +25°C, taking into account the condensation that occurs on the surface of the product due to temperature changes.
Pollution level: The pollution level is level 3.
Control loop:
1. It should be possible 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 are completed, 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-jump device, an electrical anti-jump device should be installed;
5. The accident trip signal circuit of the circuit breaker should be wired according to the "non-correspondence principle";
6. For equipment that may have abnormal working conditions or malfunctions, warning signals should be installed;
7. The power supply of spring operating mechanism and manual operating mechanism can be DC or AC. The power supply of electromagnetic operating mechanism requires DC.