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Question
In a Circuit how the MCB and Fuse ratings are calculated. 
And shall the fuse follws the MCB or it is otherwise?
 Question Submitted By :: G.venkatesh
I also faced this Question!!     Rank Answer Posted By  
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 1
IF we take an Example,

5.5kw Load,

I= Doble than Load = 11A,

MCB Must has More than 11A,

& Fuse Must than 1.5 Tmes more than MCB.
 
Is This Answer Correct ?    141 Yes 69 No
Pragnesh
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 2
Sorry my answer is favour to you bu Your answer for that
question FUSE RATING is rejected by our college professor
 
Is This Answer Correct ?    30 Yes 27 No
Balaji Venkateswaran.v
 
 
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 3
the current rating of the fuse must be equal to the load
because the fuses melting point disconnect the circuit if
the current load becomes greater than the specific rating.
in high ruputer capacity fuse,the fuse able to carry1.2
over the rating.meaning 20% more.MCB rating calculation is
to know how mush the consuption load and according to that
cal.we decide the rate of MCB from the catalog rating of
CB, must be more than the load.DONT FORGET THE SHORT
CIRCUIT CALCULATION
 
Is This Answer Correct ?    30 Yes 12 No
Daher
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 4
there is different calculation for three phase and single
phase.
first you maintioned that it is either sigle or three
 
Is This Answer Correct ?    31 Yes 16 No
Anil
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 5
IT CAN BE CALCULATED BY THIS FORMULA ALSO P=V I COS PHI

I=P\VCOSPHI FOR SINGLE PAHSE
I=P\1.732*VCOSPHI
 
Is This Answer Correct ?    42 Yes 16 No
Abdulsubur
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 6
depending on the full load capacity ratings is calculated.
It is not necessary to connect MCB and fuse both,one is
enough.if u want to connect both then first fuse the MCB
 
Is This Answer Correct ?    11 Yes 15 No
Shaik
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 7
MCB RATING SHOULD BE 2.5 TIMES OF LOAD CURRENT AND FUSE
RATING GRETER THAN (1.5 TIMES)MCB
 
Is This Answer Correct ?    13 Yes 26 No
Mahesh S.chorghe
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 8
Under no load condition it is 20% of rated current of the
device.And in full load condition it is 120% of rated
current.For eg., consider the rated current of a motor is
19ampere.then under no load it is 20% of 19 =3.8ampere
=5amp(approx).for full load it is 120%of 19 = 22.8ampere=20
ampere(approx).
 
Is This Answer Correct ?    24 Yes 6 No
Vignesh R
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 9
Dear all there are two parameters for determining the
selection of MCB
1.Type of load-
Resistive(e.g Home circuits)-B curve MCB(operates @
3-5 times the rated current)
Inductive-Motors etc.-C curve MCB(operates @ 5-10
times the rated current)

Highly inductive load-Transformers etc.-D curve MCB
(operates @ 10-15 times the rated current)

2.current in the circuit.

Now you will find that curve along with rated current is
mentioned on the MCB e.g. C6(do not confuse rated current
with the breaking capacity which is the max. current CB can
witstand)
C6 means this MCB is usable for Inductive load where
Circuit can witstand upto 30 Amps and MCB should trip if
Current Reaches 30 amps(5times of 6Amps)-60 Amps(10 Times)

Rated current is mentioned as 'ln' in electrical literature.
 
Is This Answer Correct ?    30 Yes 4 No
Viraj Dua
 
  Re: In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?
Answer
# 10
Fuse size can be calculated by this formula, 225% of full
load current.
locked rotor amps is the 500% of full load current.
 
Is This Answer Correct ?    4 Yes 18 No
Moideen.t.y
 

 
 
 
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