The Residual Current Circuit Breaker (RCCB) or commonly known as the circuit breaker is an electrical safety device that cuts off the electricity supply immediately upon detecting leakages that may result in an electric shock. Current leakages can be caused by factors such as ageing or exposed wires, faulty electrical appliances, and damaged insulation.

The RCCB is usually located in the distribution board (also known as DB box) or circuit breaker box in your home. It can be identified as a switch with a "Test" button. For HDB residents who are unable to locate your RCCB, please contact your Branch Service Line at 1800-225-5432.