Ambient Air Temperature: Upper limit of ambient air temperature: +40°C; Lower limit of ambient air temperature: -5°C; The 24-hour average of the ambient air temperature shall not exceed +35°C.
Altitude: The altitude of the installation site shall not exceed 2000m.
Atmospheric Conditions: The atmospheric relative humidity shall not exceed 50% at an ambient air temperature of +40°C; higher relative humidity is permissible at lower temperatures. The monthly average maximum relative humidity in the wettest month shall be 90%, occurring simultaneously with a monthly average minimum temperature of +25°C, while taking into account the condensation that may form on the product surface due to temperature fluctuations.
Pollution Degree: Pollution Degree 3.
Control Circuits:
1. The system shall be capable of monitoring the integrity of the control circuit protection devices, as well as their tripping and closing circuits, to ensure the proper operation of the circuit breaker.
2. The system shall be capable of indicating the normal "closed" and "open" position states of the circuit breaker, and shall provide distinct indication signals during automatic closing and automatic tripping operations.
3. Upon the completion of a closing or tripping operation, the command pulse shall be released-that is, the power supply to the closing or tripping circuit shall be interrupted.
4. In the absence of a mechanical anti-pumping device, an electrical anti-pumping device shall be installed.
5. The signal circuit for circuit breaker fault tripping shall be wired in accordance with the "non-correspondence principle."
6. For equipment where abnormal operating conditions or faults may potentially occur, a pre-warning signal device shall be installed.
7. The power supply for spring-operated and manually operated mechanisms may be either DC or AC; however, the power supply for electromagnetic operating mechanisms is required to be DC.
