(1) Protective button(push button switch): a button with protective shell, which can prevent the internal button parts from mechanical damage or people from touching the live part. Its code is h.

(2) Dynamic off button(push button switch): under normal conditions, the switch contact is a button for on.

(3) Dynamic closing button(push button switch): under normal conditions, the switch contact is a button that is disconnected.

(4) Dynamic on-off button(push button switch): under normal conditions, the switch contact has both on and off buttons.

(5) Button with light: the button is equipped with signal light, which is not only used to issue operation command, but also used as signal indication, and its code is d.

(6) Action click button: that is, click the button with the mouse.

(7) Explosion proof button: a button that can be used in places containing explosive gas and dust without causing explosion. Its code is B.

(8) Anti corrosion button: it can prevent the invasion of chemical corrosive gas, and its code is f.