Explain the function of an ELCB with neat
sketch
Ans:
Earth Leakage Circuit Breaker or ELCB:
In
case of earth leakage either through human body or through poor insulation of
the instrument, the current may leak to the earth. That current is sensed through the help of
electronic circuit that operates a relay.
This relay disconnects the supply from the load. Hence the danger of
shock is avoided.
Whenever
there is no leakage to the earth, the current in phase wire and neutral wire
will be equal. If there is a leakage to
the earth, the current in neutral wire will be less compared to the phase
wire. The electronic circuit detects
this current difference and this sensor disconnects the supply.
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