The VCB�s and the panels have been optimally designed for Indian local electric supply conditions and ambient. All critical parts are manufactured on CNC machines and finished products are subjected to stringent quality tests in accordance with documented procedures, which are in line with international standards. The Vacuum Circuit Breakers are rated upto 12kV, 1250A, 3Ph. 50Hz. with a short-circuit breaking current upto 25kA. The construction is compact in design, fully fabricated.

Designed for use with air insulated
metal enclosed switchgear and
controlgear and indoor applications. EVK CB’s are suitable to rapid
auto-reclosing.
The switching tests of breaker were
carried out inside MME* type
cubicle.

According to Paschen Curves, high values of dielectric strength of medium can be obtained at very low or very high pressure levels. The characteristics of insulation at very low pressure values provide very low distance between contacts. This distance varies from 10 mm to 20 mm considering the voltage level.

Vacuum circuit-breakers does not require an interrupting or insulation medium. In fact, the interrupters do not contain ionizable material.

Advantages of Vacuum Circuit Breakers:
� Very long lifetime of the contacts (This provides longer breaker life.)
� Less maintenance required
� Less moving parts in mechanism
� Less force needed to separate the contacts (since the distance between them is shorter.)
� Environment friendly. Since interruption takes place in vacuum medium, VCBs do not require
gas or liquid addition. This reduces the possibility of leakage of gas (or any material) that can
be harmful for environment.