Answer / n.p

vcb full form is vaccum circuit breaker. its contacts arc
quenching medium is vaccum. vcb used in 11kv ht line for
on/off operation.

Answer / amit upadhyay dscl

VCB is a vaccum circuit breaker inwhich uses vaccum for
medium. it is installed in HT side of line i.e. 11kv.

Answer / atul pradhan

VCB means vaccum ckt breaker it can be used at any voltage
but due to its high cost it is generally used at HT side.
contacts of vcb operates in vaccum chamber.
It have spring charge moter,spring is used to operate
moving contacts.
It have closing & tripping coils & auxillery contact switch.
Can be operated manually also

Answer / swamy

VCB stands for vacume circuit breaker. it is get contact by
produceing arc in vacume.VCB is used in HT side ie 11kv and
above.

Answer / pankaj

VCB means VACUUM CIRCUIT BREAKER.In this vacuum are used as a arc quenching medium.
It can be use for 3.3kv to 36kv. Generally it is used in indoor sub-station.Also OVCB is used in Outdoor sub-station.

Answer / saroj senapati

vcb means vaccum circuit breaker. when any fault has arise the circuit then it is tripped ,example the short circuit,earth fauth over current has arised...

Answer / hasan mehdi

VCB is Vacuum Circuit Breaker. It is installed in 11 kv RMU
(Ring Main Unit) System.

Answer / rod

Answers 1 and 2 are partly correct, however they can be
used on any voltage from 440volt to around 40.5 kV, I
currently use them on sump pump motors 60kW 440 volt but
have used themon 33kV

Answer / ravi kumar

VCB Means vacuum circuit breaker, its contact arc quenching medium is vaccum ckt breaker its used in ht line .
safety: earth fault relay , master trip relay, supervision relay,
its used for main supply ON and OFF with safety .
Its using supply test faulty condition and unfaulty condition.

Answer / tej4fun

VCB stands for Vacuum Circuit Breaker
As the name suggests that the phenomenon of arc quenching will happen in Vacuum medium.
It is generally used in MV applications(3.3-36KV)
The main advantages of VCB being it has high dielectric strength(8 Times higher than air and 4 times higher than SF6) which makes it easier to quench the arc with less gap between the contacts. Also the life of VCB is considerably high owing to less maintenance and ease of Vacuum bottle replacement. Also unlike SF6 it is not a harmful to environment and less dangerous comparative to OIL CB. Generally the pressure maintained in Vacuum chamber is 10^-6 bar.

Regards
Raviteja V

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