1. Thermal conductivity of insulating layer
The role of the insulating layer, in addition to preventing electric shock, another function as important as preventing electric shock is flame retardant. The better the thermal conductivity of the insulating material, the better the flame retardancy. Therefore, the quality of the insulating material determines the current carrying capacity of the probe from another aspect.
2, material conductivity
This mainly depends on the conductor material, such as common copper wire and aluminum wire. The conductivity of copper is at least 30% higher than that of aluminum. And when necessary, there may be silver lines. In addition to the substance of the material, it also depends on the purity of the material. For example, the copper material, the highest purity red copper, has a much higher conductivity than the next-class brass.
3, probe core area
This is what we often call the "wire diameter", such as 2.5 square millimeters, 4 square millimeters, etc., which are commonly used in decoration, refer to the wire diameter. It is just emphasized here that what determines the current carrying capacity is not the cross-sectional area of the entire wire, but the cross-sectional area of the conductor in the wire. The thicker the line, the greater the current carrying capacity.
Intrinsic factors such as the probe core area, material conductivity, and insulating layer conductivity of the high current test probe determine the current carrying capacity of the probe. The thicker the probe core, the higher the purity of copper in the conductive material, and the better the thermal conductivity of the insulating material.