Why Can Copper Terminal Blocks Operate For A Long Time And Maintain High Stability?

While copper terminal block has lower mechanical strength than brass, its superior ductility allows for the use of larger cross-sectional areas in design to achieve the required strength. In crimp and bolted connections, the plastic deformation characteristics of pure copper ensure that contact pressure can be maintained over a long period. The relevant standard DIN 43671-1975 clearly specifies the different current-carrying capacities of painted copper busbars and bare copper busbars. Painted copper busbars, due to the increased thermal emissivity of the surface coating (0.9 vs 0.4), have approximately 25% higher current-carrying capacity for the same specifications, directly demonstrating the contribution of surface treatment to long-term working capacity.

In extreme temperature shock tests (-40℃ to 85℃ cycling, 5 cycles), copper distribution block showed no significant decrease in appearance, insulation, and withstand voltage performance, indicating that its molecular structure has a relatively balanced resistance to temperature stress. This is the core reason for choosing copper terminal strip when designing power distribution systems for critical infrastructure such as railways and power plants.