1. Basic Structure and Main Functions of Relays Relays are mainly composed of coils, armature, moving contacts and static contacts. When the current passes through the coil, a magnetic field is generated to attract the moving contacts to move and contact with the static contacts, so that the terminal 1 and terminal 2 conduct, so that the main circuit forms a loop, so that the controlled electrical appliances can be put into work. Thus it can be seen that the relay circuit actually includes two parts: the control circuit which is operated by the coil and the main circuit which is operated by the contact. The pair of contacts in the main circuit can only operate if a working current is flowing through the relay coil.
The main functions of the vehicle relay are as follows: (1) to control the strong current with weak current; @ Reduce the number of manual switches; (3) achieve the purpose of sequence control with electrical appliances; (4) to protect small switches and thin wires, so as to ensure the safe and orderly operation of electrical equipment; ⑤ Some models (such as Iveco car Sofim diesel common rail engine) use many miniaturized relays with internal resistors/diodes.
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