Isolator is a off load device which is used for isolating the
down stream circuits from upstream circuits for the reason of any
maintenance on down stream circuits. It is manually
operated and does not contain any solenoid unlike circuit breaker. it should not be operated while it is having load. first the
load on it must be made zero and then it can safely operated. Its
specification only rated current is given. But circuit
breaker is on load automatic device used for breaking the circuit in case of abnormal conditions like short-circuit, overload
etc., it is having three specification 1 is rated current and 2 is short
circuit breaking capacity and 3is instantaneous tripping
current.
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