How do signal relays work?
A relay is a commonly used device in an automatic control system. It is used to turn on and off a circuit to issue control commands and reflect the status of the device to form an automatic control and remote control circuit. Relays are used in all areas of automation. Relays widely used in railway signal technology, called signal relays (in signal systems, may be referred to as relays), are important components in railway signals. It plays an important role either as a core component of a relay signal system or as an interface component of an electronic or computerized signal system. The reliability of relay operation directly affects the reliability and safety of the signal system.