Q. Which type relay is used in the HT panel?

Answer

Relays are automatic devices that automatically close their connections when they detect an abnormality in an electrical circuit. These contacts each close in turn, completing the circuit created by circuit breaker trip coil, causing the circuit breaker to trip and disconnect the problematic area of the electrical system from the rest of the working circuit.Protection relays can be divided into electromagnetic, static, and mechanical categories based on how they operate. Relays are actually nothing more than a collection of closed or open contacts. When actuation parameters are provided to the relay, all or some of these particular contacts change their states. Therefore, contacts that are open become closed, and vice versa. The electromagnetic activity of a solenoid in an electromagnetic relay causes the shutting and opening of the relay contacts.