Button switches can be classified according to operation mode and protection mode. Common button types and features:
(1) Open type: Suitable for mounting on the panel of the switch board, control cabinet or console. The code is K.
(2) Protective type: With protective cover, it can prevent the internal button parts from being damaged by mechanical or human touched parts, code H.
(3) Waterproof: Sealed enclosure prevents rainwater from entering. The code is S.
(4) Anti-corrosion type: It can prevent the intrusion of chemical corrosive gases. Codenamed F.
(5) Explosion-proof type: It can be used in places containing explosive gas and dust without causing explosion, such as coal mines. Codenamed B.
(6) Knob type: Rotate the operation contact by hand, there are two positions on and off, generally panel mounted. The code is X.
(7) Key type: Use the key to insert and rotate to prevent misoperation or for special operation. The code is Y.
(8) Emergency: There is a large red mushroom button protruding from the outside, and it is used to cut off the power when it is emergency. Codenamed J or M.
(9) Self-supporting button: The button is equipped with self-sustaining electromagnetic mechanism, which is mainly used in power plants, substations or test equipment. The operator exchanges signals and issues commands, etc., which is generally panel operation. The code is Z.
(10) Lighted button: The button is equipped with a signal light. It is used as a signal indicator in addition to the command to release the operation. It is mostly used on the panel of the control cabinet and console. Codenamed D.
(11) Combination: Multiple button combinations. Codenamed E.
(12) Interlock type: multiple contacts interlock with each other. Codenamed C.
Classified by application and structure of the contacts
(1) normally open button
(2) normally closed button
(3) Composite button
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