So, similarly, if I want to carry out the maintenance of the section shown above, I’ll simply open the two disconnectors or isolators indicated with blue arrow. To understand this, we’ll have a look on a below single line diagram. It does not operate automatically.Īs the name suggest, disconnector or isolator is used to disconnect or isolate part of a system which needs to undergo the maintenance work. However, to operate isolator or disconnector you have to either go to the disconnector and press the pushbutton or, you have to operate it from the control room.Whenever the breaker gets command from relay it operates. Circuit breaker can work automatically.It also does not have any insulation medium like SF6 gas or oil or vacuum. Why we cannot operate isolator in on load condition? Because, disconnector has no mechanism to interrupt the fault or normal current. And hence, disconnector is called as an Off-load device. We can only operate disconnectors in current zero condition i.e. Whereas, disconnectors or isolators has no ability to break normal or fault currents.And hence it is also called as an On Load device. You can operated circuit breaker when the supply is on and as well as when the supply is off. Circuit breaker is a device used for interruption of normal as well as short circuit current.
Disconnector switch symbol download#
You can also download the image of difference between circuit breaker & isolators, link for which is provided at the end.
In this tutorial, we’ll see the difference between circuit breaker and isolator or disconnector.
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