The role of the automobile relay is to control the size and on-off of the current. The automobile relay is an automatic control device whose output will change leaps and bounds when the input (electricity, magnetism, sound, light, and heat) reaches a certain value. Class relays have large switching load power, high shock resistance and vibration resistance. The automobile relay is composed of a magnetic circuit system, a contact system and a restoration mechanism. The magnetic circuit system is composed of iron core, yoke, armature, coil and other parts; the contact system is composed of static reeds, movable reeds, contact bases and other parts; the restoration mechanism is composed of restoration reeds or tension springs.