Answer / balram raturi

ciruit breaker operates on load but isolaters are operated
on no load or to isolate the healthy system.

Answer / ammajirao

The circuit breaker can operate in both ON load and OFF load
because quenching medium is available to extinguish the arc
but in case of isolator, it should operate in OFF load
only because of no quenching medium.

Answer / koli60

c.b is protective equipment which is used to
protect tran. line in abnormal condition. we can operate
c.b. manualy as well as automaticaly .
while isolater is also protective equipment . but
isolater cant be operated automatically .
in normal condition isolater contacts are closed .
but c.b. is opened ........

Answer / ankit

In the simplest form:

An ISOLATOR is a manual circuit breaker while Circuit
Breaker does this with the help of a relay.

Regarding the arc quenching medium, isolator too have air
as arc quenching medium.

And,

An iso. is an off-load device but a CB is onload.

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