Difference Between B Curve & C Curve in MCB.

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Difference Between B Curve & C Curve in MCB...

Answer / 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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Difference Between B Curve & C Curve in MCB...

Answer / anil tandon

The MCBs are classified as per the Holding Currents and thus their usage are define accordingly,

B-Curve MCB:- They have a Holding current of 2 times of rated current and are used for Lighting Loads

C-Curve MCB:- They have a Holding current of 5 times of rated current and are used for motoring Loads.

The MCBs are classified as per the Holding Currents and thus their usage are define accordingly,

B-Curve MCB:- They have a Holding current of 2 times of rated current and are used for Lighting Loads

D-Curve MCB:- They have a Holding current of 10 times of rated current and are used for High Inrush currents E.g -Control Transformer etc

Is This Answer Correct ?

47 Yes

6 No

Difference Between B Curve & C Curve in MCB...

Answer / arshath

B curve using for domestic
C curve using for industrial

Is This Answer Correct ?

23 Yes

5 No

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