The maximum rating or a VCB is 32 KV.The maximum curent rating is up to 3000 A.
Dielectric Strength of Vacuum is more than that of Air. In HT voltage is more than LT. So VCB is used in HT & ACB in LT. Rakesh Gaikwad
In a vacuum breaker the moving contact and fixed contact are sealed inside a vacuum chamber. Electrons cannot flow in a vacuum, therefore as soon as the moving contact seperates from the fixed contact the arc meets an infinite resistance and is immediately extinguished. Because of this, the gap between the fixed and moving contacts when the breaker is open need only be a tiny amount.
Is a breaker whose contacts are in vacum cylinder. this done so the contacts will not be burnt and destroyed by the electrical arc draw while opening under load.Used in high voltage and high amp conditions.
acb means AIR CIRCUIT BREAKER ,& vcb means VACUUM CIRCUIT BREAKER
it means the rms value of 11 kv that vacuum C.B. can withstand it during 1 minute
A vacuum circuit breaker is a high-voltage circuit breaker whose contacts separate within a vacuum dielectric. The vacuum contributes to extinguishing the resulting arc because ionisation cannot take place while the arc is stretched between the separating contacts.
A circuit breaker is a switching device which can make,brake and carrying (or trip the circuit) that specified over currents for a small interval of time . There is a different types of Circuit Breaker's are there 1.According to their arc quenching media these are divided into 4 types a) Oil circuit breaker b) Air blast circuit breaker c) SF6 circuit breaker d) vacuum circuit breaker 2. According to their services the circuit breaker can be divided as a) Outdoor Circuit Breaker b) Indoor Breaker 3. According to the operating mechanism of circuit breaker they can be divided as a) Spring operated Circuit Breaker b) Pneumatic Circuit Breaker c) Hydrolic Circuit Breaker 4. According to the voltage level of installation these are divided into 3 types a) High Voltage Circuit Breaker b) Medium Voltage Circuit Breaker c) Low Voltage Circuit Breaker.
7.3 ohms
VCB (vacuum circuit breaker) is used in HV (high voltage) applications. ACB (air circuit breaker) is used in LV (low votage) applications.
Dielectric Strength of Vacuum is more than that of Air. In HT voltage is more than LT. So VCB is used in HT & ACB in LT. Rakesh Gaikwad
Understanding the components of the vacuum bottle, one can be in better position of understanding the leakage. Microprocessor monitors leakage in the Vacuum bottle.
In a vacuum breaker the moving contact and fixed contact are sealed inside a vacuum chamber. Electrons cannot flow in a vacuum, therefore as soon as the moving contact seperates from the fixed contact the arc meets an infinite resistance and is immediately extinguished. Because of this, the gap between the fixed and moving contacts when the breaker is open need only be a tiny amount.
Air-blast circuit breakers are used to disconnect high-voltage transmission or distribution circuits in the event of a fault. One circuit breaker is required for each of the three line conductors; there is not normally a neutral conductor in high-voltage three-phase transmission/distribution lines.
Is a breaker whose contacts are in vacum cylinder. this done so the contacts will not be burnt and destroyed by the electrical arc draw while opening under load.Used in high voltage and high amp conditions.
acb means AIR CIRCUIT BREAKER ,& vcb means VACUUM CIRCUIT BREAKER
"Air" and "Vacuum" describe how the breaker extinguishes the arcing current. An Air breaker opens far enough that the dielectric strenght of air is enough to extinguish the arc. A vacuum breaker's contacts are in a vacuum. Oil breakers use oil. SF6 breakers use SF6 gas to extinguish the arc.
SION Vacuum Circuit-Breaker