20 pin 6098-7357 Auto Wiring Harness Plug Cable Electric Plug Connector 0.6 Series

Temperature rise is one of the most important design key items in connector design. Abnormal temperature rise will cause connector ablation due to excessive temperature rise.

The temperature rise of the connector is affected by the following factors:

1. Contact resistance: used for conductive connection, the resistance between two contact carriers, such as the contact resistance of pinhole pair insertion, the crimping resistance between the tail of the pinhole and the wire, and the contact resistance between the threaded copper plate and the copper plate

2. Material environment heating: When the connector is in a high temperature environment for a long time, since the materials used in the connector are engineering plastics, metal, rubber, etc., especially engineering plastics require a maximum working temperature of 140 ° C, but when the product is used in an environment where the temperature is too high , The connector heats up due to its own contact internal resistance when it reaches thermal balance, and the ambient temperature is higher than the maximum operating temperature allowed by the material. At this time, if the connector is in this environment for a long time, if the internal temperature of the pinhole part of the connector is heated and the internal temperature cannot be discharged, the internal temperature will continue to rise, and the connector will generate a lot of heat, resulting in ablation of the connector Cause vehicle burning, which is a very serious problem. Both rubber materials and metal materials have a maximum operating temperature limit, which needs to be considered during design.

3. Connection of plate ends: When bolts are used during design, or preventive measures are required to prevent loosening during delivery; at the same time, when bolts are connected, torque testing must be carried out according to the operating specifications. In the case of screw connection of conductive parts, one of the main failure modes is that the tightening torque is not controlled according to the torque requirements, resulting in abnormal temperature rise and ablation of the connection parts. 

4. Derating curve: Now let’s discuss the derating curve. In my understanding, the derating curve is like you choose a commodity. This commodity will be used in a specific environment. It is necessary to determine which range of products you choose based on an attribute value of this product. The derating curve of high-voltage connectors is to provide customers with a menu, and customers can choose their own suitable dishes according to their own tastes.

The derating curve is the different values corresponding to different currents at different working environment temperatures. These values are a graph obtained by the method of plotting points. With this derating curve graph, the usage conditions of the connector can be seen more intuitively.

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