The amount of current flows through the phase (line) should return through neutral.It trips the circuit when there is earth fault current.Phase (line) and Neutral both wires connected through RCD.RCD (Residual Current Device / RCCB(Residual Current Circuit Breaker) Vacuum circuit breakers tend to have longer life expectancies between overhaul than do air circuit breakers. These can also be applied at up to 35,000 V.These breakers interrupt the arc in a vacuum bottle.Often used for main power distribution in large industrial plant, where the breakers are arranged in draw-out enclosures for ease of maintenance.Usually electronically controlled-some models are microprocessor controlled.Trip characteristics often fully adjustable including configurable trip thresholds and delays. Trip characteristics normally not adjustable.
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