The basic performance of terminal block can be divided into three categories: mechanical performance, electrical performance and environmental performance. Another important mechanical property is the mechanical life of the connector. "Mechanical life" is actually an indicator of "durability." In GB5095, they call it "mechanical operation." It takes one plug and one pull as a cycle, and takes whether the plug can normally complete its connection function (such as contact resistance value) after the specified plug and pull cycle as a basis for evaluation.