What are control devices such as pushbuttons, limit switches, and pressure switches used for in a circuit?

Control devices like pushbuttons, limit switches, and pressure switches are integral components in electrical circuits as they serve the essential purpose of facilitating specific operational functions in a predetermined manner. These devices act as inputs that can initiate, stop, or modify the behavior of electrical equipment, making them critical for automation and control systems.

For instance, a pushbutton can be used to start or stop machinery, while a limit switch may ensure that a machine only operates within certain physical boundaries, effectively protecting the system from damage or failure. A pressure switch can control a pump based on the pressure levels in a system, ensuring efficiency and safety. The functionality of these devices is explicitly designed to carry out specific actions based on the conditions they respond to, enabling reliable and predictable operation within a circuit.

Understanding the role of control devices helps in recognizing how they enable safety, automate processes, and enhance operational efficiency in various electrical and mechanical systems.