Answer / minal

Mccb is moulded case circuit breaker.
ACB is air circuit breaker.
VCB is vacuum circuit breaker.

Answer / shahnawaz

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.

Answer / senthil kumar

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.

Answer / nabeel

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.

Answer / kola raju

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.

Answer / balaji

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...

Answer / sendô

VCBs are used primarily for medium voltage circuits (11kV
in UK), due to their better arc quenching abilities (these
high voltages in ACBs or MCCBs would cause an arc between
the terminals and render the breaker useless).

The fundamental differences between ACBs and MCCBs are.
1. MCCBs cost far less than ACBs
2. MCCBs are better at lower interrupt currents (below
630/800A), ACBs are better at higher currents (800A and
above)
3. ACBs are a lot bigger and take up large sections of
panel that you might be able to fit 3 or 4 smaller MCCBs
into.
4. The main advantage is ACBs perform better under high
current short circuits, and will normally withstand for
long enough to allow a downstream device to open and clear
the fault, thus localising the short circuit trip.
5. ACBs are more easily serviced (particularly withdrawable
type).

Answer / harikishan chaturvedi

MCCB-MOULDED CKT BREAKER USED FOR LT SIDE
ACB-AIR CKT BREAKER USED FOR LT SIDE
VCB-VACCUME CKT BREAKER USED FOR HT SIDE

Answer / hashim nooruddin

MCCB-- Moulded Case Circket Breaker
ACB -- Air Circket Breaker
VCB -- Vacume Circket Breaker

MCB we use from 0 to 64 Amp.
MCCB we use from 64 to 800 Amp
ACB we use above 800 Amp

More ever at much higher current level we use VCB because
at higher current the air around it get ionised and become
conducter which causes short ckt. so at much higher current
level we generaly use VCB.

Answer / alan

amazing how much bullsh*t people put up on here about
MCCB/ACB/VCB. be careful when you read the information on
here, and don't trust 100% that the answers given are
correct.

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