The basic performance of the terminal blocks can be divided into three categories: mechanical property, electrical property and environmental performance. Another important mechanical properties are the mechanical life of the terminal blocks. Mechanical life is actually a durability indicators, the national standard GB5095 called mechanical operation. It is based on an insert and once pulled out of a cycle, normal mating cycles specified wiring terminal blocks complete connectivity (such as contact resistance value) basis as a judge.
1. Mechanical properties in terms of connectivity, the insertion force is important to the mechanical properties. Insertion force is divided into the insertion and extraction force (pullout force also known as a separation force), the requirements are different. In the relevant standards, the maximum insertion force and the predetermined minimum separation force from the usage point of view, the insertion force to be small (and thus with low insertion force, the structure of LIF and no insertion force ZIF), which indicates that, while the separation force is too small, will affect the reliability of the contact. Terminal blocks insertion force structure and mechanical life contacts the (positive pressure size) contact site coating quality (coefficient of sliding friction) of contacts arranged dimensional accuracy (alignment degrees).
2. The main electrical properties of the electrical performance of terminal blocks including the contact resistance, insulation resistance and dielectric strength.
① contact resistance of high-quality electrical connection terminal blocks should have a low and stable contact resistance. The contact resistance of the terminal blocks Europe ranging from a few milliohms to tens of milliohms.
② insulation resistance to measure the electrical connection between the terminal contact piece and the contact member between the shell and insulating performance indicators, the order of hundreds of megohms to thousands of megohms.
③ dielectric strength or the voltage resistance, dielectric withstand voltage, is a characterization of the terminal blocks between the contact member or the contact member between the shell and the ability to withstand nominal test voltage.
④ other electrical performance.
EMI leakage attenuation of electromagnetic interference shielding effect of the evaluation terminal EMI leakage attenuation is the electromagnetic interference shielding effect of the evaluation of terminal blocks, generally in the frequency range of 100MHz ~ 10GHz test.