An Automatic Relay is a type of electrical switch that automatically opens or closes a circuit based on certain pre-set conditions. These relays are typically used in automation systems to provide control over electrical devices and protect circuits from overloads, short circuits, or other abnormal conditions. The primary function of an automatic relay is to detect changes in electrical parameters (such as current, voltage, or temperature) and initiate a corresponding action, either by turning the circuit on or off.

    Working Principle of Automatic Relay

    The basic working principle of an automatic relay is relatively simple. The relay contains an electromagnet (or another type of sensor) that detects changes in the circuit's electrical properties. When a certain threshold is reached, such as an overcurrent or overvoltage, the relay will activate a switch to open or close the circuit. This action can either interrupt the circuit to protect it or establish a new path for current to flow.