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What is unique about medium voltage disconnector and its function? What differentiates it among other switching devices?

In the MV applications, the disconnector switches are used to get a separation from a circuit which could be live, with better performances than those provided by another switching device.
The performance for the dielectric withstand between open contacts is expressed through two values, for industrial frequency voltage and lightning impulse voltage, and checked with usual acceptance criteria, meaning an acceptable flashover occurrence of 2/15 under test (for self-restoring insulation).
Note: A disconnector switch is not a safety device; a dangerous misunderstanding would be to consider that a disconnector alone is able to ensure the safety for people downstream.
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