Everything You Need to Know About Relays and Their Types Relays are mainly switches used for the protection of equipment. They use two circuits, including a control circuit and a power circuit in which control circuits regulate the flow of power and perform the basic switching operation using a small amount of current. In small scale applications, fuses and similar devices are used to meet the protection purposes. On the other hand, relays are used in large scales where high reliability is required. The primary usage of relays was seen in the past to transmit and receive the information. Later on, it was improvised and used in various applications.
What are Relays? Relays are classified into several types. A standard and commonly used relay is made up of electromagnets – used as a switch. According to the dictionary, relay means the process of passing something from one source to another. Thus, relays are switches which control circuits electromechanically.