No matter which connector you use, both terms will appear in the product catalog. Both represent the nature of the connector, the ability to “connect “ correctly.

Large contact resistance in the case of the connector will lead to easy heating, wasted power consumption will increase, and will occur in the worst case is poor conduction. In other words, the smaller the contact resistance, the better. This contact resistance depends on three main elements: the terminal material/cross-sectional area of the current path and the length/resistance of the contact.

In the actual machine, in order to avoid the connection failure caused by the contact resistance of the connector, it is necessary to discuss the use method, for example, the use of multiple pins to flow the current when large current is desired.

Contact resistance consists of the following parts

Concentrated resistance RC

The resistance RC formed when the clean metal surfaces contact each other by applying a certain pressure is called concentrated resistance. Connector, due to the small contact area of the contact area, the current is compressed together when it reaches the contact area, increasing the current density, and the resistance generated by this pair is called concentrated resistance.


Film resistance RT

Metal surfaces form thin films on the surface due to adsorbed gases or oxidation or magnetization of the surface or contamination by adsorbed oxides, which tend to be a poor conductor, resulting in high contact resistance. Such films are applied to frictional breakage under a certain pressure and constant voltage, so they will contact each other with tunnel effect, so the resistance Rt is called tunnel resistance.


Insulation resistance

The insulation resistance of the connector is “no leakage current between adjacent terminals”. If the insulation resistance is too small, a short current will occur between adjacent terminals. Compared with contact resistance, the higher the insulation resistance, the better. The insulation resistance of the connector depends on the spatial distance between adjacent terminals, the material of the forming part, and the distance along the surface.


In connectors, contact resistance refers to the resistance associated with the “connector and connection part”, electrical resistance associated, and insulation resistance refers to the electrical resistance “between adjacent terminals”. Zhejiang Lianhe electronics Co., Ltd. specializes in the production of all kinds of wire to board connector, board to board connector, wire to wire, row needle row TT horn, and other kinds of electronic connector welcome new and old customers to order.

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