Answer Posted / eng. moaz rabah
MCCB protecting from
1. Short Circuit (SC)
2. Overload (OL)
ACB protects from
1.SC
2.OL
3.Over voltage
4.Under voltage
5.Earthing
6.Reverse Current Flow
imagine u have deffect in the transformer, some short
happened in the primary that means all the 11KV will be
connected to MD designed only for 415v, then the ACB can
obserb that over volt but the MCCB will burn
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