2. Disconnectors
2.1 General
Disconnectors are used to isolate a portion of a circuit on which work is to be carried out or which is to be de-energized. They are safety devices that can be electrically and mechanically locked in the open position and, in the case of conventional equipment, have a visible break in the air.
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Because of their role as safety devices, their dielectric voltage is characterized by :
a resistance between input and output greater than the resistance to earth, so that an excessive overvoltage preferably leads to an earth fault and not to a crossing of the isolating distance;
higher dielectric strength between input and output than circuit breakers...
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Disconnectors
Hybrid equipment: circuit-breaker-disconnector
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