A smart relay is a digital relay device that combines the functionality of traditional relays with the enhanced capabilities of modern technology, such as programmable logic, communication features, and remote control. Traditionally, relays were simple mechanical devices used to open or close electrical contacts to control circuits. However, with the advent of smart relays, these devices have evolved to perform more complex tasks such as monitoring, controlling, and automating various electrical systems.

    Smart relays typically consist of a microcontroller or microprocessor, sensors, input/output modules, and communication interfaces. These relays can be programmed to respond to specific inputs and provide outputs that control or monitor connected devices. Additionally, they often feature communication protocols like Modbus or Ethernet, allowing for integration with other control systems, sensors, and monitoring platforms.