Answer / y.pavan kumar

Elcb is working based on Earth leakage current. But Rccb is
not having sensing or connectivity of Earth, because
fundamentally Phase current is equal to the neutral current
in single phase. That’s why RCCB can trip when the both
currents are deferent and it withstand up to both the
currents are same. Both the neutral and phase currents are
different that means current is flowing through the Earth.
Finally both are working for same, but the thing is
connectivity is difference.

Answer / syamsunders

ELCB is the old name and often refers to voltage operated
devices that are no longer available and it is advised you
replace them if you find one.

RCCB or RCD is the new name that specifies current operated
(hence the new name to distinguish from voltage operated).

The new RCCB is best because it will detect any earth
fault. The voltage type only detects earth faults that flow
back through the main earth wire so this is why they
stopped being used.

The easy way to tell an old voltage operated trip is to
look for the main earth wire connected through it. A RCCB
will only have the line and neutral connections.

Answer / 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.

a 3 phase slip ring induction motor is wound for 4 poles on stator and 6 poles on rotor; when 3 phase balanced voltage source at 50 hz is applied to motor it will run at a)1500rpm b)1000rpm c)750 rpm d)zero rpm

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