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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
 
 
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
why the rating of transformer in k.v.a   4
what are the type of motors   3
sir, why alternator output is connected to delta side in to generating transformer? any reasion? Kirloskar 3
what is bus pt and what is the function of it   2
Who is the first Bangladeshi Everest climber? Where is his home district?   1
what is basic difference between the normal tube light choke and electionic choke ? Amaron 4
Can HT cable(11kv cable) be used for 415V, 700A requirement.   5
what is alternater?   8
can anyone plz tell me in 3 phase induction motor, whare we use STAR CONNECTED MOTOR and whare we use DELTA CONNECTED MOTOR   3
in a dc shunt motor what happens if motor takes high current,no speed   2
1)why the transformer rating in KVA insted of KW 2)why the secondary of ct is shorted and why the PT secondary is open   3
In an electrical conductor, if current flows because of flow of electrons, then why not the conductor gets thinner day by day???   1
 
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