Circular connectors are widely used in locomotive traction motors, onboard signal sensors, braking systems, door controls, onboard communication equipment, and interconnections between interior and exterior circuits due to their vibration resistance, temperature tolerance, high-protection sealing, reliable locking, and strong electromagnetic shielding capabilities. They are capable of withstanding the vehicle’s vibrations, extreme temperature fluctuations, and damp, dusty operating conditions. They reliably transmit high-power electricity, control signals, and onboard network data, ensuring the safe operation of rail vehicles and the continuous, stable functioning of various onboard equipment.