A residual current circuit breaker (RCCB) is a safety device used in electrical systems to prevent electric shocks and electrical fires. It works by detecting any imbalance between the live and neutral wires, which can indicate a leakage current. If it senses this imbalance, the RCCB quickly disconnects the electrical supply, protecting people and property from potential harm. RCCBs are commonly used in residential and commercial buildings as part of the electrical installation. They are often installed alongside other protective devices, such as fuses and circuit breakers, to enhance overall safety. Regular testing of RCCBs is recommended to ensure they function correctly.