As mining becomes more digitalized and intelligent,the requirements for the smart control of mining machinery are more and more rigid.Overhead wired electrical locomotives are the main haulage equipment in metal mines.Their safe and efficient operation secures the smooth running of mines.In the case study of the 3 t overhead wired mining electric locomotive,a dynamic braking device of an electrical motor is developed,applied,and verified by test data.The paper discussed the advantages of electric motor dynamic braking devices in terms of economic and social benefits.The device realizes the safety and efficiency of overhead wired electrical locomotive haulage,and advances intelligent and safe development progress of mines.