Circuit
Breakers:
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.Vacuum
circuit-breakers does not require an interrupting or insulation
medium. In fact, the interrupters do not contain ionizable
material.
During
the separation of current-carrying contacts, contact pressure
reduces, real contact
surface reduces and the temperature of contacts increases to melting
temperature. This produces metal vapours which initiates and supports
the vacuum arc, maintaining until the next current zero. Due to the
special geometry of the spiral contacts, the arc column is kept
rotating by the radial magnetic field produced in order to involve a
wider surface than that of a fixed contracted arc. Thus, overheating
and erosion of the contacts are prevented. So the lifespan of circuit
breaker is increased.
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