The structural characteristics of the button switch
The structure of the button switch: It is composed 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), the fixed contact and the movable contact are in a separate state.
Normally closed contact (moving break contact): refers to the contact in the original state (the electrical appliance is not subjected to external force or the coil is not energized), the fixed contact and the movable contact are in a closed state.
Normally open (moving on) button switch, when not pressed, the contact is open, when pressed, the contact is closed and connected; when released, the button switch is reset and opened 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 the opposite of the normally open button switch. When it is not pressed, the contact is closed, and the contact is opened when pressed; when the hand is released, the button switch is reset and closed under the action of the reset spring . The normally closed button is often used to control the parking of the motor and is also called the parking button.
Compound button switch: a button switch that combines a normally open and a normally closed button switch, that is, it has a normally closed contact and a normally open contact. When not pressed, the normally closed contact is closed, and the normally open contact is open. When the button is pressed, the normally closed contact is opened first, and the normally open contact is closed; when released, the button switch will first open the normally open contact and then close the normally closed contact under the action of the return spring , The compound button is used in the interlock control circuit.