Common aspects of electrical fault breaker before closing operation if the red and green are not lit, no power or control loop control has broken phenomenon. Power and control of the entire component can check the control loop is normal, when the operation switch on the green light flashes, and the red light does not shine Xi'an high-voltage vacuum circuit breakers, instrument no indication loud speaker Xian indoor vacuum circuit breaker, breaker mechanical points and closing the position indicator is still breaker OFF position, then the operating handle position and does not correspond to the position of the circuit breaker, breaker is not closed. The common causes are: closing the loop blown fuse or bad; closing the contactor is not activated; closing coil failure. When the operation after closing the circuit breaker, the green light is off, the red light goes off after momentary bright, green light flashes and there is also the horn sound, indicating that the circuit breaker is closed and then automatically tripped. The reason may be caused by a circuit breaker protection combined mechanical failure or circuit breaker tripping the circuit breaker can not be maintained in the closing state on the fault line. If the green light flashes when the operation switch on or off, the red light does not shine, but there is indication meter, mechanical points, closing position indicator in the closing position, indicating the circuit breaker is closed. Possible causes are poor contact breaker auxiliary contacts, such as normally closed contact is not disconnected, normally open contact not closed, resulting in green and red light does not flash light; also may be closing or closing red burn circuit break . The world's first circuit breaker produced in 1885, it was the beginning of a knife and a combination of over-current release. 1905, with an air circuit breaker trip-free device was born. Since 1930, with the invention advances in technology, the discovery of the principle of the arc extinguishing devices and a variety of outdoor high voltage circuit breakers, Xi'an, and gradually formed the current institution. The late 1950s, due to the rise of electronic components, has produced an electronic trip unit, up to now, due to the popularity, there has been the advent of single-chip intelligent breaker. Xi'an breaker _ Huayi Electric Power (certified) _ breaker provided by Xian Huayi power plant. Xian Huayi power plant (www.xahy.com) is a leader in Xi'an, high voltage circuit breakers, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Huayi power in leadership with the staff warmly welcome all inquiries negotiations to create electricity Huayi a better future.