Answer Posted / rajdip thakur

Earth fault relay trips when the current through the neutral exceeds a preset value.Simply it acts on the superposition theorem. Whether the vector sum of the phase current and the neutral current are same or not.If not then it operates.
But the earth leakage circuit breaker operates when some current flows from neutral to ground. We know that the voltage difference between neutral and ground is zero.It operates only when there appears some voltage.

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