A Close Look of Isolators or Disconnector Switch

Isolators are provided for isolation from live parts for the purpose of maintenance. Isolators are located at either side of the circuit breaker. Isolators are operated under no load. Isolator does not have any rating for current breaking or current making. Isolators are interlocked with circuit breakers.

Types of Isolators are:

Central rotating, horizontal swing
Centre-Break
Vertical swing
Pantograph type

NOTE: Isolator always operate in no load condition. If it will operate in on load a hude sparking will occur which will lead to burning of contacts of isolator.

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