Please pay attention to the working voltage and check with the voltage of your place to make sure this micro switch successfully work.3 terminals, COM-NO-NC,"COM" Always on, "NO" Line in-NORMAL OPEN, "NC" Always off-NORMAL CLOSE, applicable to AC control circuits.Can be used on a CNC milling machine for limit control switches,also fit on golf cart , or replace/repair original broken switch in vacuum,and so on.Designed to control the movement of a mechanical part; Typically utilized in industrial control applications to automatically monitor and indicate whether the travel limits of a particular device have been exceeded.High precision mechanism design offering acute operation and long life.