Answer Posted / ankit

Based on the type of application MCB are classified as
B,C,D,K curve type.

Specifically, these curves denotes the instantenous
tripping current, if fault current crosses the designated
mark.

B : 2-5 times the rated current.
C: 5-10 " " " "
D : 10-15 " " " "


C- curves type are used for heavy currents in normal
working.(e.g. Heaters, Gyesers, Irons)

D-curves types are used for heavy inrush currents.(Motors
etc)

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