The Principle Of The Button Switch Structure

There are many types of button switches, which can be divided into common snap button type, mushroom head type, self-locking type, self-reset type, rotary handle type, indicator light type, light symbol type and key type, etc. There are single button, double Button, i button and different combinations. Generally, it adopts a water accumulation structure, which is composed of a button cap, a return spring, a static contact, a moving contact, and a shell. It is usually made into a composite type, with a pair of normally closed contacts and normally open contacts. Some products can pass through The series connection of multiple elements increases the number of contact pairs. There is also a self-holding button, which automatically maintains the closed position after being pressed, and can only be opened after the power is cut off.

When the button is not pressed, the moving contact is connected to the static contact above, and this pair of contacts is called a normally closed contact. At this time, the moving contact is disconnected from the static contact below. This pair of contacts is called the normally open contact: press the button, the normally closed contact is disconnected, and the normally open contact is closed; release the button, The original working state is restored under the action of the return spring.