Electromagnetic switch refers to the control switch on the automobile starter, which is the starter ( DC motor, transmission meshing mechanism, Electromagnetic switch) one of the three major components, its working principle is that the coil generates magnetic adhesion after power-on, making the movable iron core move, therefore, on the one hand, pulling the transmission meshing mechanism makes the starter pinion move forward to mesh with the flywheel ring gear of the engine, on the other hand, pushing the switch contact to connect, making the DC motor run on electricity, thus driving the engine to start.