Push Button Switch Introduction

1. Push button function

A button is a control switch that is operated by applying force from a certain part of the human body (usually fingers or palm) and has a spring energy storage reset. It is the most commonly used master electrical appliance. The current allowed to pass through the contact of the button is small, generally not more than 5A. Therefore, under normal circumstances, it does not directly control the on-off of the main circuit (high-current circuit), but sends a command signal 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.

2. Push button Structural principles and symbols

The button is generally composed of a button cap, a return spring, a bridge-type moving contact, a static contact, a strut link and a shell.

The opening and closing state of the contacts when the button is not affected by external force (that is, static), is divided into stop button (that is, moving and breaking button), start button (that is, moving and closing button) and compound button (that is, that the combination of moving and closing contacts is as follows: integrated button).

When the button is under the action of external force, the opening and closing state of the contact changes

3. push button choose

Select the type of button according to the occasion and specific purpose. For example, the button embedded on the operation panel can be selected as the open type; the cursor type should be used to display the working status; the key-operated type should be used in important occasions that need to prevent misoperation by personnel; the anti-corrosion type should be used in places with corrosive gases.

Choose the color of the button according to the work status indication and work situation requirements. For example, the start button can be white, gray or black, preferably white or green. The emergency stop button should be red. The stop button can be black, gray or white, preferably black or red.

Select the number of buttons according to the needs of the control loop. Such as single button, double button and triple button.


Post time: Sep-19-2022