Each of them means one kind of meaningOpening type: it is suitable for embedding and fixing on the panel of switchboard, console or control cabinet. Code name is K. Protective: with a protective shell, can prevent the internal button parts from mechanical damage or human touch the electrified part, code name is H. Waterproof: with a sealed shell, can prevent the intrusion of rain water. Code S. Anti-corrosive: can prevent the intrusion of chemicals and corrosive gases. Code F. Explosion-proof: Can be used in places containing explosive gases and dust without causing explosion, such as coal mines and other places. Code B. Knob type: rotate by hand to operate the contact, there are two positions of on and off, generally for panel mounting type. Codename X.
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