This is TACT SWITCH KW11-3Z 5A 250V Micro Switch Round Handle 3 Pin N/O N/C for 3D Printers. Microchip is ideal for application in any form of circuitry that controls voltage and currently rated components.
It is a sense-sensitive switch that forces the passive motor through which some travel into electronic contact cause speed, but to turn on the electric circuit. It has a small space, instant motion, and small style handling. Widely used in electronic products, appliances, electrical and electronic appliances, household appliances and so on.
For example computer mouse, electronic car, communication device, commodity war industry, gas meter, gas water heater, coal gasifier, small appliances, etc.