Answer Posted / badshah

In an rccb when current more than the prescribed value is
induced then the secondary coil of the relay trips the
elcb. for example if a heater is connected in a circuit
and when the resistance i.e the megger value of the heater
body to the earth is less and if more current flows through
the ciruit and the earth then the elcb or the rccb trips to
protect the circuit. earth leakage is something when there
is an imbalance of load in each phase in a 3 phase circuit
and where u can measure a voltage or impedence between the
neutral and the earth.

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