Contactor is an important part of industrial plug and socket, and its quality plays a decisive role in the quality of the whole industrial plug and socket, so the technical measures of contactor quality are very important. The power socket has one or more seats into which circuit wiring can be inserted, through which various wiring can be inserted to facilitate connection with other circuits. Embedded socket is embedded in the integrated communication cabinet, which is a power supply device that provides basic DC power for communication and data equipment in the same cabinet. It also has certain versatility. NEMA wiring device must be as small as possible in order to realize frequent commutation, but also to realize braking during commutation and acceleration after commutation. Therefore, it is necessary to adopt commutation device quickly and braking device effectively. Advantages of industrial plugs and sockets: high reliability and high level of protection.Classification of common contacts1, plug-in contactAs the name implies, it is a plug-in contact, as shown in the figure:Advantages: Made of brass, low material cost and easy processing.Disadvantages: The resistivity of brass contact surface relative to silver contact surface is also larger, especially the resistivity of brass after oxidation is larger. Sufficient contact pressure can effectively prevent excessive resistance caused by excessive temperature, but it will make it difficult for industrial plugs, plugs, plugs, plugs, plugs and plugs to be pulled out, making it even more inconvenient to use.2. Butt contact, as shown in the figureAdvantages: Strong short-circuit current resistance.Disadvantages: Contacts can only be made of silver alloy, so they are expensive.Related parametersA, resistanceShrinkage resistance: the resistance caused by the contraction of current wire at the contact surface is called shrinkage resistance.Thin film resistance: the contact surface forms a thin film in the air, and the generated resistance is called thin film resistance.Contact resistance: contact resistance = contraction resistance+film resistanceB, contact pressureContact pressure refers to the pressure that can make the two ends of the contact contact each other. The greater the contact pressure, the smaller the contact resistance.Although the product design has standard parameters, there are many factors that affect the contact quality, such as temperature, roughness and so on. Therefore, we must have a good scientific design and equipment and consider all possible changes to ensure the reliability of contact design.