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Isolator is an offload mechanical switch which use to disconnect an electrical circuit to ensure electrical safety during maintenance. Isolators are used in substations to isolate apparatus such as circuit breaker, transformer and transmission line at a time of maintenance. It is usually not intended for normal control of the circuit but only for safe isolation. There is mainly four types of isolators. Centre break isolator Double break isolator Pantograph isolator Knee type isolator Centre Break (CB) isolator designed with two rotating insulators mounted on an integrated base frame. Both insulators hold current carrying aluminium rods. In this, current carrying path is between the vertical cylinder rod and horizontal contact fingers. Rotation of insulators are opposite to each other. The current path opening to the side creates a bigger phase distance in parallel arrangements than with other types. Fig. Centre break isolator Double Break (DB) isolator has t