MCCB,VCB,ACB all are of different type with same
functioning.
all of them are used to isolate the power or to trip the
power at the time of fault in line and thus save the
circuit from further damage and isolate unheathy part from
healthy one.
if the circuit if of low rating we can go ahead with MCCB
but for high rating circuit we go for costlier CB that is
ACB/VCB because they are more reliable and have long life.
MCCB - Thermomagnetic operaton-For large surges in ct- In
distribution boards-bimetallic strip responding to less
extreme but longer_term over_current conditions-applicable
for
low voltages.
ACB - low volt power cb-trip characteristics r
adjustable-air s the arc quenching medium-applicable upto 440V.
VCB - medium volt power cb-trip char. adjustable-mechanical
sys. used for trip & open-Vaccuum s the arc quenching
medium-applicable upto 36kV.
MCCB,ACB,VCB all the three are protective devices only.
They are used to isolate the system which is connected
below them at fault conditions. Eg, Overload, Short
circuit,Earth fault.
Depending upon the operating voltages and level of
protection(Fault Level) needed for the system ,these three
protection device are selected.
For Eg: If the operating voltage are below 1100V, depend
upon the fault level we can use MCCB or ACB.
Simillarly if operating voltage are more than 1100V,VCB are
used.
Mccb is moulded case circuit breaker.
ACB is air circuit breaker.
VCB is vacuum circuit breaker.
But Basic Differnce Is
Mccb use for Low value of current(16A,10A..)
Mccb depend upon Number of Pole
ACB USE FOR PROTECTION IN TRANSMISSON OF POWER IN POWER PLANT
VCB USE FOR PROTECTION IN DISTRIBUTION OF POWER IN POWER PLANT
MCB is stand for miniture circuit breaker.It is for low
voltages.
MCCB is stand for moulded case circuit breaker. It is for
medium voltages.
ACB is stand for Air circuit breaker.It is for high
voltages.
MCCB: means moulded case circuit breaker which use ark
quenching device as AIR which is used upto 500 Amps only
ACB:air circuit breaker which use quenching device as air
and used upto 3000 Amps at 415 volts
VCB:vaccum circuit breaker which use ark quenching device
as a vaccum and used for 415 volts.6.6 KV,11 KV,33 KV,132
KV,220 KV also.
Mccb is moulded case circuit breaker.
ACB is air circuit breaker.
VCB is vacuum circuit breaker.
MCB is stand for miniture circuit breaker.It is for low
voltages.
MCCB is stand for moulded case circuit breaker. It is for
medium voltages.
ACB is stand for Air circuit breaker.It is for high
voltages.
MCCB which is nothing but moulded case circuit breaker.
ACB is nothing but Air circuit breaker and Vcb is Vaccum
circuit breaker..The main difference between last two thing
is the arc quenching medium.ACB is air and VCB is
vaccum.these two things are used for power tr and
distribution and MCB,MCCBs are used in small rating
machines also...
