A Circuit Breaker Relay (CBR) is a device that monitors the electrical current flowing through a circuit and ensures that the circuit remains intact when operating under normal conditions. When an overcurrent situation or a short circuit is detected, the relay sends a signal to the circuit breaker, which interrupts the flow of electricity to prevent damage to the circuit and connected devices. The primary purpose of the relay is to protect the electrical system from fault conditions that could result in equipment damage, fire hazards, or system failures.