Answer / naresh kumar dhal

making capacity=2.55*symmetrical breaking capacity

Always ckt breakers are rated in its symmetrical breaking
capacity.It is the rms value of fault current that a ckt
breaker can handle for short duration of time,which is
called short time rating.
If breaker is rated 10 mva,then its symmetrical breaking
capacity is 10mva.i.e root3*v*I*10-6=10mva,from this u
calculate current.Which is the symmetrical breaking current

Answer / pillay

making capacity of a circuit breaker means when you switch
on the breaker the breaker can operate safely or withstand
upto the stated amount.

The same applys to breaking capacity of a breaker which
means when it switches off it can withstand up to the stated
amount at the time of offing. The unit used is usually KVA
or MVA.
Some breakers can have a high breaking capacity but a low
making capacity. This means when switching on it should not
be loaded but can be switched OFF with a high load.

Answer / vs

ans 1 is absolutely wrong .ans -2 is right .making capacity
is always higher than breaking capacity .

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