Contact force is one of the basic elements in terminal blocks. If there is not enough contact pressure, a good conductive material is of no use. Because, if the contact force is too low, there will be displacement between the wire and the conductive sheet, resulting in oxidative pollution, so that the contact resistance increases and lead to overheating. In the case of the DRTB2.5 pressed wire frame assembly, an actual contact force of up to 750N can be generated by applying only 0.8Nm of torque to the screw, independent of the wire cross section. Therefore, the use of terminal crimping frame has no environmental influence, large contact area, large contact force permanent connection. Voltage drop small contact voltage drop size is also one of the dimensions to identify the quality of the wiring block. Even with a small force distance applied to the screw, the voltage drop value is still significantly lower than the limit required by VDE0611. Meanwhile, the applied torque varies over a wide range and the voltage drop is almost constant. Therefore, although different operators use different amounts of torque, it does not affect the quality of the connection. This is another proof of the reliability of the crimping frame at the terminal. A contact force with a large self-locking function is meaningful only if it is persistently applied to the wire.
https://www.bossgoo.com/product-detail/non-insulated-spade-Terminals-61374045.html The terminal uses the crimping frame for maximum reliability in this respect. During the screw tightening process, the threaded tongue on the crimping frame springs up, resulting in a reaction force against the screw. The change in wire diameter due to temperature is offset by the elastic action of the wire pressing frame itself, so there is no need to tighten the screw again. The wire frame was subjected to an aging test for 168 hours at 130oC, followed by a vibration test for 168 hours at 20 times the acceleration of gravity. After completing these more rigorous tests than VDE0611, the wire pulling force from the wire frame is still more than VDE0611 specified
As much as six times higher, and the voltage drop remains constant. This shows unequivocally the maintenance-free nature of the crimping frame at the terminal. Air-tightness various environmental factors, such as temperature and humidity of the air a definitive effect on the terminal, terminal must have the ability to endure the test of adverse environmental factors, according to the regulation of DIN41640. 76 of the test and practical experience has shown that even in connection with no end of pressure under the condition of soft wire, wire frame can maintain its airtight performance.
