What is the primary application of limit switches?

The primary application of limit switches is to act as safety devices in circuits. Limit switches are essential components used in various mechanical and automation systems to ensure safe operation by detecting the presence or position of an object or equipment. They serve to prevent machinery from operating outside predefined limits, thereby helping to avoid potential accidents and equipment damage.

For example, in a conveyor system, limit switches can be used to determine when the conveyor has moved to a specific position, triggering an action such as stopping the motor or activating an alarm. This capability helps maintain operational safety by ensuring that machinery does not operate under unsafe conditions, such as overextending or colliding with other objects.

In contrast, the other options do not accurately represent the primary function of limit switches. Controlling motor speed primarily involves devices like variable frequency drives or speed controllers, while regulating current and voltage pertains more to power supply and electrical components. Automating repetitive tasks is typically achieved through the use of programmable logic controllers (PLCs) or other automation solutions, rather than solely through limit switches. Thus, the correct answer underscores the vital safety role that limit switches play within various systems.