Answer / ramakrishna m

Mainly The CB is selected on the basis of Voltage capacity
of the system and the currents to be interrupted.
Also selection depends on whether it is indoor application
or Outdoor.

Answer / k

i dont know why people are not telling the exact thing

1 decide it is lv or mv
2 if it is lv use nec 2002 fla tables
3 if it is mv then u need to consider time coordination and
discrimination tables
hope this helps

Answer / reza

it deponds on rated current plus 25% ,breaker
effeciency ,kind of loads ,weather condition and inrush
current .

Answer / khalid

thire two furmalea :

chooce the correct CB by stander IE flow current
mulityplaie 1,25%

the copcity current load of CB 80%

Answer / vaishali hankare

CB is selected on the basis of it's Breaking capacity,
Making capacity, operating voltage, operating
current,system frequency, insulation level & type of use
i.e indoor or outdoor.

Answer / patrick

CBs are selected accordind the following:
voltage rating
I fault current
load current
environment

Answer / dattasri

It depemds on the rating of the equipment which is to be
protected.
the rating of the CB shud be more than the rating of the
Switch gears for more efficient protection

Answer / anil kumar jaiswar

Circuit breaker is selected on the basis of,
1. Operating Voltage,
2. The Current carrying capacity,
3. The Breaking capacity,
4. The Making capacity of the breaker

Answer / rangan nathan

not only by the modle or type etc but is reliablity and
proven records

Answer / sandy

it depends on current carrying capasity

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