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In VCB, The two contacts are present in a vaccum, When there is a fault these contacts are forced to open resulting arch ,as all we know arch does not flow through Vaccum so it extinguishes thus vcb seperates two circuits.

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11y ago
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13y ago

Circuit breakers interrupt current flow under certain conditions. The interrupting method can be in air, oil, vacuum or gas. Most modern circuit breakers 2400 volt through 38kV are vacuum where the contact open in a vacuum bottle. Since there is no air in a vacuum, there is no carbon build up or arc to extinguish.

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Q: What is vaccume circuit breaker?
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