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Answer Posted / 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.
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