the categories of button switches

来源:Dongguan Yanghan Industrial Co., Ltd.  时间:2022-05-26

We will introduce the categories of push button switches in detail. Although we touch many key switches in our daily life, they are all similar and feel almost the same? In fact, although they may look similar in appearance, their function or category may be very different. Therefore, the categories are described in detail below:
(1) Push button switches are classified according to their use and contact structure:
1. Normally open contact (moving contact): refers to the contact in which the fixed contact and the moving contact are separated in the original state (the electrical appliance is not subjected to external force or the coil is not energized).
2. Normally closed contact (moving and breaking contact): refers to the contact in which the fixed contact and the movable contact are in a closed state under the original condition (the electrical appliance is not subjected to external force or the coil is not energized).
3. Normally open (moving, closing) button switch, the contact is disconnected when not pressed, and the contact is closed when pressed; when released, the push button switch is reset and disconnected under the effect of the reset spring. In the control circuit, the normally open button is often used to start the motor, also called the start button.
4. Normally closed (dynamically disconnected) push button switches are the opposite of normally open push button switches. When the end is pressed, the contact is closed; when pressed, the contact is opened; when the hand is released, the push button switch is reset and closed under the effect of the reset spring. Normally closed button is generally used to control motor stop, also known as self-reset button.
5. Composite push button switch: a push button switch that combines the normally open and normally closed push button switches into one, that is, there are normally closed contacts and normally open contacts. When not pressed, the normally closed contact is closed and the normally open contact is opened. When the button is pressed, the normally closed contact is opened first, and then the normally open contact is closed, which can be regarded as a self-locking button. When released, under the effect of the reset spring, the push button switch first opens the normally open contact and then closes the normally closed contact. The interlocking control circuit adopts the composite button.