How does a Relay function in an aircraft electrical system?

In an aircraft electrical system, the function of a relay is primarily to connect the power source to the operated component. A relay is essentially an electromechanical switch that allows a low-power signal to control a higher-power circuit. When an electrical current flows through the relay coil, it creates a magnetic field that moves a lever or armature, closing the circuit that connects the power source to the device being operated, such as a motor or light.

This function is crucial because it enables aircraft systems to use minimal input (e.g., from a cockpit switch or control) to control larger systems, enhancing both the efficiency and safety of the electrical system. By using relays, the aircraft can manage various components effectively without having to run high-power signals through the pilot controls, thereby reducing the risk of overload and ensuring that even sensitive equipment can be operated safely.

Understanding the role of relays is essential for maintaining and troubleshooting electrical systems in aircraft, as it highlights the interplay between control and power management in avionic technology.