What about the release device and the contactor and the circuit breaker?
and undervoltage failure can automatically cut off the circuit, its function is equivalent to the fuse switch And a combination of overheat relays and the like.
Circuit breaker according to its use is divided into high-voltage circuit breakers and low-voltage circuit breakers, high and low voltage line is more vague, generally more than 3kV called high-voltage electrical appliances.
A circuit breaker is a switching device capable of closing, carrying and breaking current under normal circuit conditions and capable of bearing and driving current under abnormal circuit conditions for a specified period of time
Circuit breakers can be used to distribute power, not frequently start the asynchronous motor, the power lines and motors and other protection, when they have a serious overload or short circuit
