The pressing means is the terminal between the conductor and the conductive mechanism of the pressure generated only generate sufficient pressure to ensure a low contact resistance, a good connection is formed , the reliability of the pressing means is connected to a wire directly affected good or bad. Speaking of screw-type terminals , screws, studs and are important components platen clamping mechanism ; screwless terminals on , the spring or springs are important components of the card hold-down mechanism . No screw-type terminals , clamping mechanism is mainly spring , so crucial to the selection of the spring, it is necessary to ensure that there is sufficient contact pressure to ensure that not too much damage to the wire , spring terminals is more reliable screwless terminals. When the line , you can block or suppress the spring by pushing a screwdriver , into the line , release the spring , the spring tension back pressed firmly to the wire , resulting in sufficient contact pressure , and then strangled with a spring wire cutting edge , so it does not pull out loose or man-made .

Throughout the assembly process , must withstand the high temperature and the preheating zone to a temperature by conduction wave soldering of the terminal body . Flux shall not affect the terminals , must be easy to remove , can not have any residue . The entire assembly process must be cleaned with water . Preheat temperatures often reach 100 ° C or higher , the peak temperature of 280 ° C are not uncommon. Perforated solder pin must be accurate positioning, size appropriate , balanced place , and have good weldability, it is a good insertion and welding.

In the course of the entire assembly must withstand high temperatures generated by the impact of heat treatment , mainly used in welding preheating and convection preheat the heat conduction to the solder pin and solder to melt tin plate interface . Robust contact welding performance when starting the motor or short-circuit , high current to make contact . Weld head can not be released , with silver contacts easier welding. AC contactor main contacts should be used in anti-welding ability of silver-based alloys, such as silver iron, silver and nickel.

Technicians use in the terminal operation, will keep pressing mechanism is closed , as this will directly affect the quality of the wire connections. But this knowledge are in the majority of technicians will have some doubts , the paper do a simple analysis of the terminals of the press mechanism . Terminals in the column without air gap magnetic system , residual magnetism is too large. The remanence of the pole faces at the gap to the file part of the gap is 0.1-0.3mm, or in parallel with the coil ends of a capacitor 0.1uF . Enable the surface of a core of a contact period of time after the oil or greasy . The core surface rust oil wipe clean the surface of the core requirements of smooth, but not too light , otherwise it is easy to cause delay release .