There are many types of micro switches, and there are hundreds of internal structures. According to the volume, there are ordinary, small, and ultra-small; according to the protection performance, there are waterproof, dust-proof, and explosion-proof types; Single type, double type, multi-link type. At present, there is also a strong disconnect micro switch (when the reed of the switch does not work, the external force can also make the switch disconnect); according to the breaking capacity, there are ordinary type, DC type, micro-current type, high-current type . According to the use environment, there are ordinary type, high temperature resistant type (250 ℃), ultra-high temperature resistant ceramic type (400 ℃); micro switches are generally based on unassisted pressing accessories as the basic type, and small stroke type and large stroke type are derived. . Different auxiliary pressing accessories can be added according to the needs. According to the different pressing accessories added, the switches can be divided into various forms such as button type, reed roller type, lever roller type, short boom type, long boom type and so on. Micro switches are used for automatic control and protection in equipment that requires frequent circuit switching, and are widely used in electronic equipment, instrumentation, mining, power systems, household appliances, electrical equipment, as well as aerospace, aviation, ships, missiles, tanks. It has been widely used in the above fields, and the switch is small, but it plays an irreplaceable role. At present, the micro switches on the domestic market have different mechanical lifespans ranging from 3W times to 1000W times according to different use requirements. Generally, there are 10W times, 20W times, 50W times, 100W times, 300W times, 500W times and 800W times, which are generally used in China. Beryllium bronze, tin bronze, and stainless steel wire are used as reeds. Foreign ALPS can reach 1000W times. Their reeds are made of rare metal titanium.