Relay-Earth Fault Relay

A relay is an electrically operated switch. It consists of input terminals for single or multiple control signals, and a set of operating contact terminals.

Relays are used to control a circuit by an independent low-power signal, or where several circuits must be controlled by one signal. Relays were first used in long-distance telegraph circuits as signal  were used repeaters. Relays extensively in telephone exchanges and early computers to perform logical operations.

Earth Fault is an inadvertent fault between the live conductor and the earth. When earth fault occurs, the electrical system gets short-circuited and the short-circuited current flows through the system. The fault current returns through the earth or any electrical equipment, which damages the equipment. It also interrupts the continuity of the supply and may shock the user. To protect the equipment and for the safety of people, fault protection devices are used in the installation .The earth fault relay is basically a protection device used selectively for earth fault protection. These can be used for both primary and backup protection in an electrical system. These are used everywhere from Transformers, MCCBS, ACBs, motors etc.

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