vcb breaker - Wikitechy https://www.wikitechy.com/interview-questions/tag/vcb-breaker/ Interview Questions Wed, 08 Sep 2021 05:52:48 +0000 en-US hourly 1 https://wordpress.org/?v=6.9 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png vcb breaker - Wikitechy https://www.wikitechy.com/interview-questions/tag/vcb-breaker/ 32 32 What is the difference between MCCB & ACB & VCB ? https://www.wikitechy.com/interview-questions/electrical-engineering/what-is-the-difference-between-mccb-acb-vcb/ https://www.wikitechy.com/interview-questions/electrical-engineering/what-is-the-difference-between-mccb-acb-vcb/#respond Thu, 05 Aug 2021 03:17:21 +0000 https://www.wikitechy.com/interview-questions/?p=1375 What is the Difference Between MCCB & ACB & VCB ?
MCCB ACB VCB
MCCB is stands for Moulded
Case Circuit Breaker.		 ACB is stands for Air Circuit Breaker. VCB is stands for Vacuum Circuit Breaker.
The moulded case circuit breaker
which use ark quenching device as
AIR which is used upto 500 Amps only.		 The Air Circuit Breaker which use
quenching device as air and
used upto 3000 Amps at
415 volts.		 The 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.
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.		 Low volt power cb-trip
characteristics r adjustable-air
s the arc quenching medium
applicable upto 440V.		 Medium volt power cb-trip char. Adjustable-mechanical sys. used for trip & open-Vaccuum s the arc quenching medium-applicable upto 36kV.
MCCB s the used low rating Lt pannel. ACB s the used high rating Lt pannel. VCB s the used high rating Ht pannel.
MCCB is used for load purpose and
is should used up to 1200-1500A only.		 ACB is used for low tension (LT)
panel it should carry up to
4000A and more.		 VCB is used for high tension (HT) panel it means carry 11KV and low amps rating it can withstand at long time at high Voltage also.
]]> https://www.wikitechy.com/interview-questions/electrical-engineering/what-is-the-difference-between-mccb-acb-vcb/feed/ 0 How to calculate VCB current rating for 2000 KVA transformer ? https://www.wikitechy.com/interview-questions/electrical-engineering/how-to-calculate-vcb-current-rating-for-2000-kva-transformer/ https://www.wikitechy.com/interview-questions/electrical-engineering/how-to-calculate-vcb-current-rating-for-2000-kva-transformer/#respond Thu, 05 Aug 2021 03:08:39 +0000 https://www.wikitechy.com/interview-questions/?p=1371

How to calculate VCB current rating for 2000 KVA transformer ?

  • Power is defined as the rate of doing work, it is the work done in unit time, and the SI unit is given as watt (W) which is joules per second (J/s).
  • The formula is given by P = V x I.
    • P for Power.
    • V for Voltage.
    • I for Current.

Power:

Power=1.732*415*I
I=2000000/1.732*415
I=2782.5 amps

VCB

Vcb=I=2000000/1.732*11000
I=104.97amps Then approximately I=105 A
Suitable VCB 125 AMPS

What is VCB ?

  • VCB stands for Vacuum Circuit Breaker and are mainly used in circuit breakers that use medium to high levels of voltage, where the arc quenching occurs in a vacuum.
  • In this circuit breaker, the fixed and moving contact is enclosed in a permanently sealed vacuum interrupter.
  • The arc is extinct as the contacts are separated in high vacuum.
  • It is mainly used for medium voltage ranging from 11 KV to 33 KV.
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