Button switch is a kind of commonly used switch, so what are the structural characteristics of button switch?
Structure of push-button switch: it is composed of push-button cap, return spring, fixed contact, movable contact, shell and strut connecting rod.
Normally open contact (movable contact): refers to the contact in which the fixed contact and the movable contact are separated in the original state (the electric appliance is not subjected to external force or the coil is not energized).
Normally closed contact (moving broken contact): refers to the contact in which the fixed contact and the movable contact are closed in the original state (the electric appliance is not subjected to external force or the coil is not energized).
Normally open (movable) button switch, when not pressed, the contact is off, and when pressed, the contact is closed and connected; When released, the button switch is reset and disconnected under the action of the reset spring. In the control circuit, the normally open button is often used to start the motor, also known as the start button.
Normally closed (dynamic off) button switch is opposite to 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 is reset and closed under the action of the reset spring. Normally closed button is often used to control motor parking, also known as parking button.
Compound push-button switch: a push-button switch that combines normally open and normally closed push-button switches into a whole, that is, it has normally closed contacts and normally open contacts. 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 disconnected first, and then closed after the normally open contact; When released, under the action of the return spring, the push-button switch first disconnects the normally open contact and then closes the normally closed contact. The compound button is used in the interlock control circuit.
Therefore, the structural characteristics of the button switch ensure its good performance.
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