What are the characteristics of the structure of the push button switch?

The push button switch is a relatively commonly used switch, so what are the structural characteristics of the push button switch?

The structure of the button switch: it consists of a button cap, a return spring, a fixed contact, a movable contact, a shell and a pillar connecting rod.

Normally open contact (moving contact): refers to the contact in the original state (the electrical appliance is not subjected to external force or the coil is not energized), and the fixed contact and the movable contact are separated.

Normally closed contact (moving contact): refers to the contact in the original state (the electrical appliance is not subjected to external force or the coil is not energized), and the fixed contact and the movable contact are in the closed state.

Normally open (moving close) push button switch, when it is not pressed, the contact is disconnected, and when it is pressed, the contact is closed and connected; when it is released, the button switch is reset and disconnected under the action of the return spring. In the control circuit, the normally open button is often used to start the motor, also known as the start button.

The normally closed (moving off) button switch is opposite to the normally open button switch. When it is not pressed, the contact is closed, and when it is pressed, the contact is disconnected; when the hand is released, the button switch resets and closes under the action of the return spring . The normally closed button is often used to control the motor to stop, also known as the stop button.

Composite button switch: A button switch that combines normally open and normally closed push button switch, that is, has normally closed contacts and normally open contacts. When not pressed, the normally closed contacts are closed and the normally open contacts are open. When the button is pressed, the normally closed contact is first disconnected, and then the normally open contact is closed; when the button is released, the push button switch is under the action of the return spring, firstly disconnects the normally open contact, and then closes the normally closed contact . Composite buttons are used in interlock control circuits.