1. emergency type: there is a big red mushroom button protruding out of the outside, for emergency to cut off the power supply;
2. explosion-proof type: can be used in places containing explosive gas and dust without causing explosion, such as coal mines and other places;
3. button with light: the button is equipped with signal light, which is not only used to issue operation commands, but also used as signal indication, and is mostly used on the panel of control cabinet and console;
4. waterproof type: with sealed shell, can prevent rainwater intrusion;
5. knob type: rotating operation contact by hand, with on-off two positions, generally panel-mounted;
6. self-sustaining button: the button is equipped with a self-sustaining electromagnetic mechanism, which is mainly used in power plants, substations or test equipment for operators to communicate signals and issue instructions, generally for panel operation;
7. key type: insert and rotate the key to operate, which can prevent misoperation or operate by special personnel;
8. anti-corrosion type: can prevent chemical corrosive gas;