Relays are crucial components in electrical circuits, used to control a circuit by opening or closing contacts in response to a signal. These components allow one circuit to control another while keeping the circuits electrically isolated from each other. With the variety of relay types available, each suited for specific applications, it’s important to understand their key differences to ensure optimal performance. In this article, we will compare different types of relays, such as electromagnetic, solid-state, reed, and time-delay relays, discussing their advantages, applications, and limitations.