Demitas marked vacuum circuit breakers are suitable to IEC 56/IEC 62271-100 and TS EN 62271-100 standarts. They got the certificate of suitability about IEC standarts from accredited test laboratories. Demitas marked vacuum circuit breakers can provide the needs of all systems of which rated voltage is up to 36 kV and rated nominal current is up to 2500 A. They don't need any maintenance process and they have got long mechanical, electrical life and they also have got enough speed for reclosing and reliability. ABOUT VACUUM INTERRUPTERS The rated operating current can be interrupted at least 20.000 times and the rate short-circuit breaking current 100 times because contact eroion is extremely small. Switching vacuum does not produce any by-products. The hermetically sealed vacuum interrupter ensures that there is no interaction with the environment. Because of contact pressure applied the very low contact resistance remains pratically constant regardless of the number of switching operations carried out. Further more, the fact that the contacts can not oxidise ensures that they remain metalically clean even after years of operation. ARC EXTINGUISHING When the contacts separate, the current to be interrupted initiates a metal vapour arc discharge and flows through this plasma until the next current zero. The arc is then extinguished and the metal vapour condenses on the inner surfaces of the arc chamber within a few microseconds, resulting in rapid building up of dielectric strength. The contacts are so designed as to rotate the arc over their surface by the self-generated magnetic field. This prevents localized overheating during the interruption of large currents.
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Vacuum Circuit Breaker (frontal) 
