RCD (Residual Current Device / RCCB(Residual Current Circuit Breaker)
Phase (line) and Neutral both wires connected through RCD.
It trips the circuit when there is earth fault current.
The amount of current flows through the phase (line) should return through neutral .
It detects by RCD. any mismatch between two currents flowing through phase and neutral detect by -RCD and trip the circuit within 30Miliseconed.
If a house has an earth system connected to an earth rod and not the main incoming cable, then it must have all circuits protected by an RCD (because u mite not be able to get enough fault current to trip a MCB)
RCDs are an extremely effective form of shock protection
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