Main classification

Buttons can be classified according to operation mode and protection mode. Common button types and features:

Open type: suitable for inserting and fixing on the switch board,

On the panel of the control cabinet or console. The code is K.

Protective: With protective cover, it can prevent internal button parts from being damaged by mechanical or human touched parts, code H.

Waterproof: Sealed enclosure prevents rain from entering. The code is S.

Anti-corrosion type: It can prevent the intrusion of chemical corrosive gases. Codenamed F.

Explosion-proof: It can be used in places containing explosive gases and dust without causing explosions, such as coal mines. Codenamed B.

Knob type: Rotate the operating contact by hand, there are two positions on and off, generally panel mounted. The code is X.

Key type: Use the key to insert and rotate to prevent misoperation or for someone to operate. The code is Y.

Emergency: There is a big red mushroom button protruding from the outside.

Turn off the power when it is emergency. Codenamed J or M.

Self-sustaining button: The button is equipped with a self-sustaining electromagnetic mechanism, which is mainly used in power plants, substations or test equipment. Operators exchange signals and issue commands, etc., generally for panel operation. The code is Z.

Illuminated 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.

Combination: Multiple button combinations. Codenamed E.

Interlocking: Multiple contacts interlock with each other. Codenamed C.

Classified by purpose and structure:

1, normally open button

2, normally closed button

3, composite button