2. Meet the requirements of automatic devices and relay protection devices. (When the controlled device is in standby, the device can be automatically put into operation by the automatic device through the circuit breaker; when the device fails, the relay protection device can automatically trip the circuit breaker and remove the fault.)
3. It can reflect the actual position of the circuit breaker and the integrity of the monitoring control circuit. (The circuit breaker can reflect its working status through the position of the SA handle, the signal light and the corresponding sound and light signals, whether it is in normal operation or fault action, or when the control circuit is broken.)
4. The operation of branching and closing should be completed in a short time. (Because YC and YT are designed according to the working current for a short time, the circuit breaker should be automatically disconnected immediately after the circuit breaker to avoid burning the coil.)
5. It can prevent the circuit breaker from jumping and jumping in a short time in a short time.
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