The tact switch is also known as a relatively sensitive switch. When used, it can reach the standard of operating force. Apply pressure to the switch operating position to close and close the switch. When the working pressure is removed, the switch will be cut off. Its working principle is based on metal materials. The shrapnel withstand force changes to complete the conduction. The tact switch is composed of: insert, base, shrapnel, button, and back cover, in which the waterproof tact switch adds a layer of silicon nitride plastic film on the shrapnel.

The tact switch has the advantages of small loop resistance load, precise operating force deviation, and diversified specifications and models. It is widely used in the fields of electronic products and household appliance brands, such as: audio and video products, electronic products, controllers, communications Equipment, household goods, security equipment, small toys, computer machines. Due to the standard of the tact switch to the natural environment (the elasticity of the pressure lower than 2 times / the temperature and humidity standard of the natural environment and its electrical equipment), the large and medium-sized machinery and equipment and the buttons with long-term load are all applied with conductive glue or dome switches. Hardware pieces are immediately replaced, such as medical equipment, TV controllers, etc.

The tact switch is the fourth-generation switch product developed along with the regulations of the development trend of electronic information technology. The initial volume was 12mm*12mm, 8mm*8mm, and now it is 6mm*6mm. There are three types of product structures: column type, vertical type and vertical type with ground end. Now there are two types of combination type (3M, 4M, **, 6M, **) and resistor tact switches, which can reach various types in China. Various electronic equipment regulations. And now there is the fifth generation switch - plastic membrane switch, the function is the same as the tact switch, it is mainly used for instrumentation and CNC lathes, but the resistor is large and the touch is poor. In order to better get rid of the poor tactile feeling, there is also a touch yellow film instead of a silver layer in the plastic membrane switch.