In order to improve traditional circuit breakers,a new type of external fee control circuit breaker was designed according to the relevant South Grid standard.Compared with traditional circuit breakers,this design possesses many new features including that:the prevention capability of limit switch man-made destruction,resist damage of short term misconnection to 380 V high voltage,prevent long-term static motor rust lock,shield the electromagnetic interference of high power interphone in very near distance,removal large and costly transformers,etc.It can pass the function test and performance test of relevant national standard and enterprise standard.The circuit is simple,the number of component is fewer,the function is comprehensive,the reliability is high,and has the advantage of low power,low cost.
