There are many kinds of micro switches, with hundreds of internal structures. According to volume integration, there are ordinary type, small type and ultra small type; According to the protection performance, there are waterproof, dustproof and explosion-proof types; According to the breaking form, there are single connection type, double connection type and multi connection type. At present, there is also a strong disconnect microswitch (when the reed of the switch does not work, the external force can also disconnect the switch); According to breaking capacity, there are ordinary type, DC type, micro current type and high current type. According to the service environment, there are ordinary type, high temperature resistant type (250 ℃), ultra high temperature resistant ceramic type (400 ℃)?? Microswitch generally takes no auxiliary press accessories as the basic type, and derives small line program and large line program. Different auxiliary pressing accessories can be added as required. According to the different pressing accessories added, the switch can be divided into button type, reed roller type, lever roller type, short boom type, long boom type and other forms?? Microswitches perform automatic control and safety protection in equipment requiring frequent circuit replacement. They are widely used in electronic equipment, instruments and meters, mines, power systems, household appliances, electrical equipment, aerospace, aviation, ships, missiles, tanks and other military fields. They have been widely used in the above fields. Although the switch is small, it plays an irreplaceable role?? At present, according to different application requirements, the mechanical life of microswitches on the domestic market ranges from 3W times to 1000W times, 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 springs in China. Alps abroad can achieve 1000W times at most. Their springs are made of rare metal titanium.