What is a limit switch used for?

• A. To sense the position of moving components
• B. To regulate speed
• C. To provide power
• D. To debounce signals

Answer: (A)

A limit switch is used to detect the end of travel or a defined position of moving parts. When a moving component reaches the switch, it changes state to tell the control system that the part is in a specific position, so the machine can stop, reverse, or trigger a process at that point. This is why sensing the position of moving components is the correct purpose. It isn’t primarily for regulating speed, providing power, or handling signal debouncing—those tasks come from other parts of the system, while the switch’s main role is to indicate position.