Answer / shrek

ISOLATORS work on off-load where as ACB works on on load. ACB
operates on faults conditions in system.

Answer / asish

ACB means air circuit breaker, it can be used in on load
condition,i.e both normal and fault condition due to its arc
quenching method where as in case of isolator, it is used as
a off load switch.

Answer / yaswanth

isolator is used to isolate the individual loads&A.C.B's are
used to isolate the whole power to all individual loads in
fault position

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2 Answers  

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Can earth resistance be measured without connecting the earth electrode? and should earthing connections be disconnected What is the effect of connecting two cables of different sizes in parallel with supply? Thanks in Advance. I am intrested to get in touch with some tecnocrats/engineers,my mail i.d is : hiremathvijay@rediffmail.com

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what is use of mccb.

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