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There are many kinds of microswitches, including hundreds of internal structures, common type, small type and ultra small type according to body integral; waterproof type, dust-proof type and explosion-proof type according to protection performance; single connection type, double connection type and multi connection type according to breaking form. At present, there is also a strong disconnect microswitch (when the reed of the switch does not work, the external force can also make the switch open); according to the breaking capacity, there are common type, DC type, micro current type and high current type. According to the use environment, there are ordinary type, high temperature resistant type (250 ℃), super high temperature resistant ceramic type (400 ℃) - the micro switch is generally based on the type without auxiliary press accessories, and derives small line program and large line program. Different auxiliary press accessories can be added according to the needs. According to the different press accessories switches, they can be divided into button type, reed roller type, lever roller type, short boom type, long boom type and other forms. Micro switches are widely used in electronic equipment, instruments and meters, mines, power systems, household appliances, electrical equipment, as well as military fields such as aerospace, aviation, ships, missiles, tanks and so on. Although they are small, they play an irreplaceable role. At present, the mechanical life of microswitch in domestic market varies from 3W times to 1000W times according to the different use requirements, generally 10W, 20W, 50W, 100W times, 300W times, 500W times and 800W times. Beryllium bronze, tin bronze and stainless steel wire are generally used as reed in domestic market, while Alps in foreign market can reach 1000W times at most, and their reed is made of rare metal titanium.