Introduction to basic knowledge of commonly used electrical push-button switches-JINBEILI ELECTRICAL

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Introduction to basic knowledge of commonly used electrical push-button switches

Sep 22,2022

Push-button switch Mainly refers to the capacitive type Push-button switch , also known as a touch switch. Push-button switch It is an electronic switch and belongs to electronic components. It first appeared in Japan. When using it, press the switch in the operating direction to meet the operating force. When the pressure is released, the switch is closed, and its internal structure is switched on and off through the stress change of the metal leaf. The push-button switch consists of an insert, base, elastic sheet, button, and cover plate, among which the waterproof Push-button switch elastic sheet is added with a layer of polyimide film.

　　1. Push-button switch function. A button is a control switch operated by a part of the human body (usually a finger or palm), and spring energy storage reset. It is one of the commonly used main command devices. Generally speaking, push-button switches do not directly control the on and off of the main circuit (high-current circuit). The current allowed by its contacts generally does not exceed 5A, so they are basically used in the control circuit (low-current circuit) to send instruction signals to control contactors, relays, and other electrical appliances, and then they control the on and off, function switching, or electrical interlocking of the main circuit.

　　2. Push-button switch structural principle and symbol. Usually, a push-button switch consists of button cap, static contact, bridge-type dynamic contact, reset spring, support connecting rod, and shell. When button not subjected to external force (i.e., static), the on-off state of the contact can be divided into start button (i.e., make contact button ), stop button (i.e., break contact button ) and composite button (i.e., make and break contacts combined into one button )。

　　3. Push-button switch Structure code: K-open type, embedded in the operating panel; h-protective type, with a protective shell, which can prevent internal parts from being mechanically damaged or people accidentally touching live parts.

　　4. button Model and meaning: S-waterproof, with a sealed shell to prevent rainwater from entering; F-corrosion-resistant type, which can prevent corrosive gases from entering; J-emergency type, with a large red mushroom button (protruding outward) for emergency power off; X-knob type, operated by rotating the knob, with on and off positions; Y-key operation type, plug-in operation, to prevent misoperation or operation by authorized personnel; D-cursor button, equipped with a signal light, also used as a signal indicator.

　　5. Push-button switch Selection: 1. Select the type according to the application scenario and specific use. For example, buttons embedded in the operating panel can be opened; select the cursor type to display the working status; key operation should be used in important occasions to prevent personnel misoperation; corrosion-resistant type should be used in places with corrosive gases. 2. Select the color according to the working status indication and working requirements. For example, start button can be white, gray, or black, preferably white or green; emergency stop button should be red; stop button can be black, gray, or white, preferably black or red. 3. Select the number according to the needs of the control circuit, such as single button ，double button and triple button etc. button 、双 button 和三 button 等。

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Introduction to the function and installation precautions of push-button switches

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