Classification of electrical switches

　　Switch classification: can be divided into two categories: with automatic reset and without automatic reset:
　　A. Automatic reset: the basic feature is that the switch is in working state under the action of external force. Once the external force disappears, the switch can be automatically reset. The power of its contacts must meet the 10-30 current value.
　　B. No automatic reset: this switch may have one or two switches, the difference between which is how much the circuit is controlled after being switched on.
　　5. Electronic type: the switch that USES electronic components to control automobile circuit has been gradually applied. This type of switch has no contact, so there is no fault caused by contact ablation. At present the typical product is electronic dimming switch. It has two major components, namely, flexible plate switch and electronic dimming system (voltage regulation can be accomplished by using an adjusting knob on the switch surface).
　　Electronic dimming is used to eliminate the malady of wire winding resistance failure caused by the resistance being in the heating state of power supply and accelerating for a long time.
　　In addition, the electronic dimming system also adds overload current protection facilities.
　　6. Button type: this type of switch is commonly known as push switch, which can be divided into two types: no self-locking and self-locking. The former has a simple structure and is rarely used at present. Its main characteristics are beautiful appearance and simple operation. This brings the convenience to the driver's operation safety in the vehicle running.
　　The switch is currently used in Shanghai general motors "buick", Shanghai Volkswagen "passat", shenlong "fukang" and other models.
　　7. Handle switch: the handle switch mainly USES the principle of lever to achieve the control purpose, and the typical type is the current popular combination switch.
　　Due to the different electric control circuit structure selected by automobile manufacturers in different countries, the control methods adopted by them are also different, which can be divided into two categories:
　　One is the direct control type: namely the combination switch directly controls the load. This requires that the contact of the switch can withstand a large power, and the power of the controlled object is different.
　　Second, clearance control type: its characteristics is that the combination switch does not directly control the load, but control the intermediate relay, and then use the contact of the intermediate relay to control the load, so the combination switch contact power requirements are small, and the power of the control object is basically the same.