Table of Contents
Common Push Button Switch Function
A button is a control switch that is operated by a certain part of the human body (usually a finger or palm) and has a spring stored energy to reset. It is the most commonly used master electrical appliance. The allowable current through the contact of the button is small, generally not more than 5A. Therefore, under normal circumstances, it does not directly control the on and off of the main circuit (high current circuit), but sends command signals in the control circuit (small current circuit) to control electrical appliances such as contactors and relays, and then they control the main circuit On-off, function conversion or electrical interlocking.
The structure principle of the common push button switch
The button generally consists of a common push button switch cap, a return spring, a bridge-type moving contact, a static contact, a pillar connecting rod and a shell.
The opening and closing state of the contacts when the button is not acted on by external force (ie static), divided into stop button (ie moving off button), start button (ie moving on button) and compound button (ie moving on, moving off contact combination is One button).
Selection of common push button switch
1. Select the type of button according to the use occasion and specific purpose. For example, the buttons embedded in the operation panel can be open type; the cursor type that needs to display the working status; the key operation type should be used in important occasions that need to prevent misoperation by personnel.
2. Select the color of the button switch according to the working status indication and working condition requirements. For example, the start button can be white, gray or black, and white or green is preferred. The emergency stop button should be red. The stop button can be selected in black, gray or white, preferably black, or red.
3. Select the number of buttons according to the needs of the control loop. Such as single button, double button and
Triple button etc.