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Question
how we can select MCB ratings according to Voltages, Curves.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
1.We can select the MCB's acoording to Voltage is simple,if
we want 230V,select single pole MCb's else want 415V select
3 pole MCB's.

2.We can select the MCB's according to to Curves is also
simple,there are several types of curvature available..
there are,
B type: react quickly overload i.e 3-4.5 times of full load
current
Type C: react more slowly,these are recommended for
inductive with high inrush currents like fluorescent lamp.5-
10 times of Ifl
Type D: 10-20times of Ifl,recommended for very high inrush
current.
Type K: 8-12 times of full load I,recommended for cable
protection to be provided which include
motors,capacitors,and transformers
Type S: 13-17 times of Ifl,recommended for protection of
control Transformer,

Type Z:

 
Is This Answer Correct ?    31 Yes 2 No
Balakrishnan
 
Answer
# 2
MCB rating depends on voltage as well as load, so first of
all we will have an idea about load which will connected to
MCB.
 
Is This Answer Correct ?    9 Yes 2 No
Kundan Kumar
 
 
 

 
 
 
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What is difference between Step Up Transformer & Booster Transformer? can we used instead of any one? CS 2
How can CALCULAT the current carrying capacity of aluminum and cOpper cables respective of that Sq.mm ? with formulas ? Havells 8
What is the basic difference between synchronous machine and induction machiine?   1
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what is the difference between power and distribution transformer? L&T 29
ELECtrical Bhel 1
assume we are put both df/dt and vector surge relay in same bus the df/dt relay setting is +5 hz an -5HZ. we want operat the vector surge relay before the df/dt how i calculate the setting of the vector surge relay.   1
How can we measure the frequency of a rotor running in full load condition? Explain the method of measuring. Wipro 2
which one has maximum efficiency autotransformer or transformer?? and why??   2
What is Gnat,Ant,Rabbit &Dog overhead conductor? Please explain.   1
 
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