The main circuit breaker is very important in the daily operation of the HXD1 electric locomotive, it is the electrical connection between the body and the contact network and the total switch of the split, and it is also an important protective device of the HXD1 electric locomotive, which can cut off the total power supply of the electric locomotive in time, effectively and safely when the electric locomotive is in serious trouble, so that other components of the HXD1 locomotive are not damaged. In the process of daily use and maintenance of HXD1 electric locomotive, Datong Lake East segment found that the main circuit breaker failure frequency is relatively high, has begun to affect the operation safety of the locomotive, so it is urgent to reduce the frequency of main circuit breaker failure. This paper will analyze the causes of the failure of the main circuit breaker in recent years, and make corresponding measures and suggestions for its daily maintenance in order to improve the reliability, safety and stability of the HXD1 electric locomotive by taking several typical faults in the daily life of the owner of the HXD1 electric machine.
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