Answer / gunasekaran

MCB it is operating automatically when load or fault current
exceed the predefined value but isolator is not operating
automatically it is not breaking the load or fault current.

Answer / vivek srivastava

Actually Isolator is a manual operating device whereas MCB
works automatically when fault current exceeds the set
value.

Answer / sanjay dalvi

Dear all,

Isolator is used to isolate the system during fault from
healthy system.

Mcb it is miniature circuit breaker which is used to
protect the sysem from short circuit,earth fault...it
operates automatically when relay gives the command to
circuit breaker.

Answer / nikhil hari

Isolater is used to isolate our devices form Supply. but
there is no protection in isolater. If any fault current
comes our devises or isolater get damaged. Eg: Switch
But MCB is used for circuit protection rather than
isolation.If any fault current comes MCB will trip and
protect or devise.
Different types of MCB's are there B,C,D curve MCB. that
depend up on Instantinous tripping Chara of MCB.

Answer / elangkumanan

isolator mean to main switch but mcb means control circuit
fuse that is different to u

Answer / chandu

isolator is a operating manual system.
mcb(miniature circuit breaker)is operates automatically

Answer / sweety kumari

Isolater is manually operated switch where as circuit breaker is auto operated switch .isolator work on off load condition only for maintenance purpose while circuit breaker is used on onload condition just to make and break the contact .

Answer / bhabani shankar dash

Isolator means for two one phase & one neutral & mcb stands
for only one phase.
MCB it is operating automatically when load or fault current
exceed the predefined value but isolator is not operating
automatically it is not breaking the load or fault current.

Answer / ramanjan

MCB will interrupt flow of fault or excess load current into the circuit under load condition.
Isolator wont interrupt flow of fault current but it is used to disconnect the faulty circuit from healty circuit under noload condition only

Answer / akshay jangra

There is not much difference. MCB is used only on LIVE wire which isolates when excess current flows and ISOLATOR is a combined form of two MCBs which isolates LIVE wire as well as NEUTRAL...

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