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With the continuous development and improvement of modern transportation systems, the demand for transport equipment has been increasing day by day, and low-voltage electrical appliances have become an indispensable part of transport equipment. In the railroad highway navigation and transportation, strong vibration, impact and natural mechanical environment have become one of the important factors affecting the stable, reliable and safe operation of electrical equipment. Molded case circuitdoi:10.11648/j.ajetm.20180302.11 fatcat:f4uvztx6z5brhdtwp4mwedk7iy