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Such a circuit breaker is a sealed unit (to preserve the vacuum), and relies on the concept that if there is no ionizable material between the contacts, there can be no arc. In practice, a sufficiently strong arc could ionize some of the metal of the contacts, but a well designed vacuum circuit breaker is quite useful for even moderately high voltages - at least into the hundreds of volts.

The vacuum is of course built into the device at manufacture.

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