How to Select a Correct Isolator Size for MCCB

Your first post.isnt it?...Isolator for mccb??...Do you mean Isolator inplace of mccb?

isolator doesnt have any type of protection in it....like short circuit or overload protection...it s jus a mechanical switch and it s used only during maintenance..................so for protecting the load , an isolator must be used in series wit mccb or mcb or fuse ......

u need to refer to isolator catalogues of schneider or abb ...select appropriate isolator based on the mccb rating.....in the catalogue you ll find its dimensions.....

The voltage rating and short circuit rating range of an isolator should be the same as that of the breaker. An isolator is selected based on the circuit current rating ( continuous current ), voltage, fault level( short circuit rating ) and BIL. The isolator provides safety during maintenance on the transformer. An isolator, when in series with the fuse, does not require short circuit rating. Isolator is an off load type dvice. The load switching is carried out by a breaker. The isolator can break the capacitive charging current of a cable and the no load inductive current of a transformer up to a certain magnitude.