Physics for IGCSE & O level - Electricity (Section 13 - No. 12)
What is the main function of an RCD (Residual Current Device)?
To prevent short circuits.
To detect and quickly cut off the power in the event of a current leakage.
To increase the voltage in a circuit.
To protect the circuit from over voltage.
Explication
An RCD detects and cuts off the power if it senses a current leakage, which can happen if someone touches a live wire.