Terminal Block: A Technical Model For Reliable Contact Retention Force
As the core component of electrical connections, the reliability of contact retention force of terminal blocks directly affects the stability of system operation. Technological breakthroughs in this field are achieving performance leaps through materials science, structural design, and process optimization.
Material selection lays the foundation for reliability
Metal plating technology is the key to ensuring contact stability. Due to its stress attenuation resistance, phosphor bronze (C519) material can maintain at least 70% of its stress intensity at a high temperature of 125 ℃, significantly improving its applicability range compared to brass (C268) at 80 ℃. In terms of insulation materials, the combination of modified nylon PA66 (flame retardant grade UL94-V0) and PPA (poly (phthalamide)) enables the terminal to maintain electrical insulation performance even under 4000V high voltage environment. Its arc resistance and leakage trace resistance effectively extend the service life of the equipment.
Structural design achieves mechanical electrical collaboration
The dual contact structure reduces contact resistance by increasing the number of contacts, reducing the total resistance value to 30% -50% of the single contact design. The spring type terminal block adopts cage type spring clamping technology, which automatically adjusts the clamping force through a wire diameter of 0.25-16mm ², achieving tool free installation and improving vibration resistance by 40%. The H-type through wall terminal is designed with adjustable compensation panel thickness to control the installation error of 1-10mm thickness panels within ± 0.1mm, ensuring mechanical positioning accuracy.
Process control ensures manufacturing consistency
The precise control of crimping process parameters is crucial. A wire compression of 15% -25% can reduce the crimping resistance to below 0.001 Ω while maintaining a tensile strength of ≥ 150N. During the production process, the terminal height tolerance is compressed from the design ± 0.05mm to ± 0.03mm to ensure that the contact pressure fluctuation of batch products is less than 5%. The dynamic vibration test shows that the terminal, which has undergone 100% single hole separation force testing, can still maintain 99.8% signal continuity under a 30G impact load.
These technological breakthroughs have enabled wiring terminals to be widely used in high reliability fields such as rail transit, industrial control, and new energy, becoming a technological benchmark in the field of electrical connections.
