Answer Posted / elaiyaraja
Voltage operated protection − Earth Leakage Circuit Breaker
(ELCB)
Current operated protection − Residual Current Circuit
Breakers (RCCB) or Residual Current Device (RCD)
It is to be noted that for the proper operation of the
ELCB, two earth terminals are required. These are the frame
earth to which all non-conducting metallic parts of
equipment are connected, and the ELCB reference earth. The
ELCB will normally operate when the voltage across the
coil, which corresponds to the voltage of the frame earth
with respect to the reference earth, exceeds about
40 V. [Note: Up to about 50V has been traditionally
considered as a safe voltage. However, it is now known that
what is important is the current that may pass through the
human body rather than the voltage, and that too is time
dependent. Thus the RCCB is now preferred to the ELCB.
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