A Residual Current Circuit Breaker (RCCB) is an essential electrical safety device designed specifically to protect people from electric shock and prevent fires caused by earth leakage currents. The RCCB operates on the principle of Kirchhoff's Current Law, which dictates that in a healthy circuit, the current flowing into the live wire must exactly equal the current returning through the neutral wire. The device constantly monitors this balance using a core balance current transformer; if an imbalance (residual current) is detected—indicating current is leaking through an unintended path, such as a person's body or damaged insulation—the RCCB instantly trips and disconnects the power supply. This rapid response (within milliseconds) is crucial for minimizing injury.
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