Answer Posted / raghavendran
MCB's have tripping curves like B,Cand D.
Curve B type of MCB's are used where maximum sensitivity is
needed and the initial starting current is 3 to 5 times the
rated current.
curve c MCB's are used where close protection is not
required and the starting current is 5 to 10 times the rated
current.these may be used while tripping the circuit due to
high starting inrush current.
curve D MCB's are used where the starting current is very
high 10 to 20 times the rated current, like high capacity
motor installation where initial starting voltage dip may be
very high.
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