A Ground Fault Relay (GFR) is an essential component in modern electrical systems, designed to protect both equipment and individuals from the dangers associated with ground faults. Ground faults occur when a live conductor comes into contact with the earth or any grounded part of an electrical system. This can cause hazardous conditions such as electrical fires, equipment damage, or even electrical shock to personnel. To mitigate these risks, ground fault relays are used to detect these faults and trigger appropriate protection measures to prevent further harm. This article provides an in-depth look at Ground Fault Relays, their working principles, applications, and types.