Description
These limit switches closely resemble rugged toggle or selector hand switches fitted with a lever pushed by the machine part. Often, the levers are tipped with a small roller bearing, preventing the lever from being worn off by repeated contact with the machine part.
Limit Switch automatically monitors and indicates whether the movement limits of a particular device have been exceeded. A standard industrial limit switch is an electro mechanical device that contains an actuator linked to a series of contacts. When an object meets the actuator, the limit switch triggers the contacts to either form or break an electrical connection.
 
Specifications 
3 Terminals:
Pin 1: Common
Pin 2: Normally Closed
Pin 3: Normally Closed
Action Type: ..............................Momentary snap action
Rated Work Current: ...................5A @ 125VAC, 3A @ 250VAC, 0.8A @ VDC
Roller Lever Arm Length: ............18mm (0.709")
Roller Diameter: .........................4.5mm (0.177")
Mounting Hole Diameter: .............2.5mm (0.098")
Mountin Hole Spacing: ................9.5mm (0.374")