Push button switch is a kind of electrical appliance that acts when pressed and resets when released, which is used to turn on and off small current circuits. It is generally used in the control circuit with AC / DC voltage below 440V and current less than 5A. Generally, it does not directly operate the main circuit, but can also be used in interconnected circuits.
Main classification of the push-button switches
Push-button switches can be classified according to operation mode and protection mode. Common push-button categories and characteristics are as follows:
-Open type: suitable for embedded and fixed on the switch board, control cabinet or console panel. The codename is K.
-Protective type: with protective shell, can prevent the internal button parts from mechanical damage or human touch live parts, codename H.
-Waterproof type: with sealed shell, can prevent rainwater intrusion. Codename S.
-Anticorrosive type: can prevent the chemical corrosive gas intrusion. Codename F.
-Explosion-proof type: can be used in places containing explosive gas and dust without causing explosion, such as coal mines and other places. Codename B.
-Knob type: Use the hand handle to rotate the contact, there are two positions on and off, generally for panel installation. The codename is X.
-Key type: with the key insert rotation operation, can prevent misoperation or for special operation. It's code Y.
-Emergency type: there is a big red mushroom button head protruding outside, for emergency cut off the power. Code name J or M.
-Self-holding button: The button is equipped with a self-holding electromagnetic mechanism, mainly used in power plants, substations or test equipment, operators to exchange signals and give instructions, generally for panel operation. Codename Z.
-Button with light: the button is equipped with a signal lamp, in addition to the issue of operation commands, and as a signal indication, mostly used in the control cabinet, console panel. The codename is D.
-Combined: multiple button combination. Codename E.
-Interlocking: multiple contacts interlocking with each other. Codename C.
By use and structure:
1, normally open button
2, normally closed button
3. Compound button
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