First, the emergency-style: big red mushroom knobs protruding from the outside, cut off the power supply for emergency use;
Second, the explosion-proof: can be used in places with explosive gas and dust without causing booster, such as coal mines and other places;
Third, illuminated buttons: Button built with lights, except for issuing the command, but doubles as a signal indication, used for the control cabinet, the console panel;
Fourth, waterproof formula: with sealed housing to prevent water intrusion;
V. knob: hand rotary operating contacts have two off positions, typically panel mounted;
Sixth, self-sustaining: Button has built a self-sustaining electromagnetic mechanism, mainly for power plants, substations or test equipment, the operator interworking signal and issue instructions, etc., usually panel operation;