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Research Progress on Electrical Contact Performance of Spring Contact Finger Structure


Release time:

2022-09-21

The spring contact finger structure is connected between the pin and the jack as a special contact. Its structural transition generates multiple contact points to form electrical interconnection. Each contact point acts as a "bridge" to balance the current flow. Then, let's learn about the research progress of the electrical contact performance of the lower spring contact finger structure!

Research Progress on Electrical Contact Performance of Spring Contact Finger Structure

The spring contact finger structure is connected between the pin and the jack as a special contact. Its structural transition generates multiple contact points to form electrical interconnection. Each contact point acts as a "bridge" to balance the current flow. Then, let's learn about the research progress of the electrical contact performance of the lower spring contact finger structure!


The spring contact finger has simple structure, small size and low cost, and is suitable for mass production. It is widely used in medium and high voltage switches, bus connectors, high current connectors, fixed electrodes, high voltage cable end parts, fuse connectors and mechanical and electronic applications. Compared with the traditional wire spring hole, twist needle and other electrical connection structures, the contact finger structure significantly increases the contact area and reduces the current density at the contact position, the flow capacity of the electrical interconnection device is doubled. The current finger touch structure includes plum finger touch, z-shaped finger touch, band finger touch, and spring finger touch. The plum finger is a stamped or stamped part. The belt finger with many assembled parts and complex assembly has no need to press the spring than the plum finger., Simple structure, many contact points, high electrical conductivity, etc, however, the spring contact finger is a new type of finger contact structure with strict requirements on material heat treatment process, high processing precision and high cost. The spring contact finger can have large tolerances and errors in the contact surface design, and has constant contact stress, small wear and long service cycle. It is widely used in moving contact contact and moving and static contact equipment in high voltage and UHV circuit breakers.

弹簧触指

The research of spring contact finger in China started late, and the main problems in the current research are that under the same shape and size conditions, the long-term current capacity has not been improved, the Joule heat caused by the contact resistance of the contact finger is too large, and the material of the contact point is softened or welded. An excessively high temperature rise will reduce the elasticity of the finger, cause poor contact, and affect the reliability of the electrical contact. In addition, high temperature may also lead to the insulation performance of the material is reduced, electrical breakdown and circuit short circuit phenomenon, in view of the above problems, domestic and foreign scholars have carried out a lot of research work, including finger contact structure design, finger contact material and electroplating process optimization. The method of increasing the contact force and increasing the contact area increases the insertion and extraction force, the material wear is accelerated, the contact material is plastically deformed or damaged, and the number of insertion and extraction is reduced.


Therefore, it is considered to ensure a large contact area and reduce the contact resistance by optimizing the structure of the spring contact finger itself. This paper summarizes the current research results from the material, structure and coating of the spring touch finger, introduces the technical methods and conclusions to improve the electrical contact performance of the spring touch finger, and aims to provide reference for optimizing the electrical life and reliability of high-power electrical interconnection devices with spring touch fingers.


The spring finger structure is the main way to achieve high-voltage and high-power electrical interconnection, and the urgent demand for current capacity and system reliability makes people increase the electrical contact capacity of the spring finger structure. This problem is very complex, mainly involving elastic mechanics, tribology, interface science, materials science and other important scientific issues. However, the spiral angle of the spring and the characteristics of the socket groove determine the insertion and extraction force (friction force) related to the contact area of the direct contact finger. Therefore, the determination of the contact area of this special structure and its main influencing factors are the keys to reduce the insertion and extraction force, contact resistance and temperature rise. The coating quality of the contact finger and the pin base is also an important link that affects the reliability of electrical contact, long-term power continuity and insertion life, among them, the type of coating, the surface quality of the coating, the stability of the surface state of the coating are also important factors affecting the electrical contact performance. In addition, the complex structural characteristics show that the rational design and reliability design of the spring contact structure can be realized by using commercial finite element simulation analysis technology and auxiliary test technology.


The above introduction is the research progress of the electrical contact performance of the spring contact finger structure. If you need to know more, please feel free to contact us!


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