Answer / vikramsenareddy

I think u want to know the difference of application
between ACB and MCB!

ACB- Air circuit breaker. it is used at incomming after
transformer secondary, b'coz at secondary side current is
more unless load is not distributed. ACB protects the
system without occuring any fault while switching on and
off of supply. B'coz it consists some mechanism to quench
the arc while occuring in system. it can used at 2500 amps.
where as in MCB(Miniature circuit breaker) there is inner
mechnism to quench the arc while operating at high
currents.that why ACB is suitable for high currents in
system.

Answer / c.r.shreedhar

MCB can carry small currents up to 100A and it is having
only thermal trip protection and breaking capacity of MCB's
are very less the maximum is 10KA, but ACB's can carry
large currents up to 6300A,breaking capacity of ACB's are
high the maximum is 120KA and it is having lot of
protections like under voltahe over voltage short circuit
and earth fault protections, user can adjest the protection
settings, most advanced feature of ACB's are communication
facility, user can monitor and set the parametrs from
remote and also he can download the history of faults with
day and time stamp. So, where ever ever user required high
grade of protection the only choice is ACB's.

Answer / parveen yadav

ACB & MCB both are circuit breakers the only diffrence is
of number of operation, Size, operational machenisem,
cooling system, breaking capacity.due to all above factors
ACB used for high rating and MCB used for distribution
system.

Answer / sanjay kumar

whenever we go for selecting a interrupting device , we
must thnk of ranges for which the are designed.

MCB IS DESIGNED FOR LOW RATING OF CURRNT AND ACB IS FOR
HIGHER VALUE OF CURRENT. ACB HAS CURRENT LIMITING FEATURES
UPTO A GOOD EXTENT.

Answer / sasi karthick a

MCB is for lower voltage and lower currents. MCB short
circuit current level is 10kA only.

ACB is ever for lower and medium voltage and high currents.
Short circuit, making and breaking currents are so high.

Both are using air for quenching medium.

Answer / pravesh

the mcb is miniature circuit breaker while acb is air
circuit breaker. in both types the difference is between
the arc quenching in mcb there is no mode of arc quenching
at pressure while in acb the arc quenching is done by high
pressure air through air chutes. mcb are not rated for very
high current while the acb are used for high currents

Answer / kanupriya

THe short circuit withstand current Icw of ACB is higher
than that of MCCB so it is used at the incoming end while
the MCCB is used for downstream protection

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