(RCCB) The residual current circuit breaker is an essential safety device in electrical systems. Its main function is to protect people and electrical equipment from the hazards of electrical leakage. When an electrical leakage occurs in a circuit, such as when a live wire accidentally comes into contact with a conductive object or a person, a small amount of current will flow through an unintended path. The RCCB is designed to detect this abnormal current flow. It continuously monitors the difference between the current flowing in the live wire and the neutral wire. If this difference exceeds a certain threshold (usually a few milliamperes), the RCCB will quickly trip and cut off the power supply. This rapid response is crucial for preventing electric shock. In case someone accidentally touches a live wire or there is a fault in an electrical appliance that causes leakage, the RCCB can act within milliseconds to disconnect the power, minimizing the risk of serious injury or even death. Moreover, the RCCB also helps protect electrical equipment from damage caused by electrical leakage. Long-term leakage can lead to overheating and damage to insulation, which can result in fires or breakdown of the equipment. By promptly cutting off the power, the RCCB can prevent such damage and extend the lifespan of electrical devices. In summary, the residual current circuit breaker plays a vital role in ensuring electrical safety by detecting and preventing electrical leakage, protecting both people and electrical equipment.