The button switch has a lot of structure, can be divided into ordinary press button type, mushroom head, self-locking, self-resetting type, rotary handle type, with indicator light type, with light symbol and key type, such as Tan, double button, I button and different combination of forms. General is the use of water-based structure, by the button cap, reset spring, static contact, dynamic contact and shell, etc., usually made of composite, there is a pair of normally closed contacts and normally open contacts, and some products can be multiple components in series to increase the number of contact pairs. There is also a self-sustaining button, can be pressed to automatically maintain a closed position, power off before opening.
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