# How to calculate VCB current rating for 2000 KVA transformer ?

## 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.