In the terminal block, the contact force is one of the basic elements. If there is not enough contact pressure, no matter how good the conductive material is, it will not help. Because, if the contact force is too low, there will be displacement between the wire and the conductive sheet, resulting in oxidation pollution, increasing the contact resistance and causing overheating. Taking the DRTB2.5 crimping frame assembly as an example, it only needs to apply a torque of 0.8Nm to the screw to generate an actual contact force of up to 750N, and the magnitude of this force has nothing to do with the cross section of the wire. Therefore, using the terminal crimping frame can have a permanent connection that is not affected by any environment, has a large contact area and a large contact force.

The magnitude of the voltage drop at the contact point with small voltage drop is also one of the criteria for identifying the quality of the terminal block. Even with a small force distance applied to the screw, the value of the voltage drop is still well below the limits required by VDE0611. At the same time, the applied torque varies over a wide range and the voltage drop is almost constant. Therefore, although the torque used by different operators is different, it will not affect the quality of the connection. This is another proof of the reliability of the crimping frame used for the terminal block. Self-locking high contact forces are only meaningful if they act on the conductors permanently.

The wiring work terminal can use the crimping frame, which also has the best reliability in China in this regard. In the process of tightening the set screw, the threaded tongue on the crimping frame does not spring up, so we have a reaction force that affects the screw. The change of the diameter of the wire caused by different temperature changes is offset by the elastic effect of the content of the crimping frame itself, so the enterprise does not need to tighten the screw again. The crimping frame on which the wire is pressed is subjected to an aging design test for 168 hours under the environmental conditions of 130oC, and then they are subjected to a 168-hour vibration strength test with 20 times the gravity and acceleration.