How does a limit switch operate?

A limit switch operates by triggering actions when a specific position or mechanical limit is reached. It is designed to detect the physical presence or position of an object within a certain range. When the object makes contact with the switch, it completes a circuit, which can activate other devices like relays, alarms, or motors. This functionality is crucial in automation and control applications, where precise positioning is essential, such as in machinery, conveyors, and safety systems.

The other options refer to different functions that are not characteristic of limit switches. For instance, detecting changes in temperature relates to temperature sensors, while monitoring voltage levels pertains to voltage sensors or meters. Regulating current flow is associated with devices like circuit breakers or current regulators, which manage electrical flow rather than detecting physical positions. Each of these devices serves distinct purposes in electrical and automation systems, emphasizing the specialized role of limit switches in positional control.