Relays are specifically used in which part of electrical systems?

Relays play a critical role in electrical systems, particularly within control circuits. Their primary function is to act as an electromechanical switch that uses a low power signal to control a larger load or power circuit. This is particularly beneficial in scenarios where the control signal must be isolated from the higher power circuit for safety or operational requirements.

In control circuits, relays permit the automation of switching processes, enabling devices to be activated or deactivated remotely or in response to specific conditions. For example, in a home automation system, a relay might allow a low-voltage control switch to turn on a high-voltage appliance without the two systems being directly connected.

While relays can certainly be involved in power circuits as they can control higher amperage devices, they primarily serve their unique purpose in control circuits where operational automation and switching are required. The interpretation that relays are only used in control circuits is limiting, but it highlights their central role in signal manipulation rather than as a direct mechanism in high-power applications.

This is significant because it distinguishes the function of relays from other components that may work within power circuits directly without the intermediary function that relays provide in control circuitry.