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What do you mean by S.F.U. unit? application of it.
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Answer Posted / sunil kumar rout
sfu -switch fuse unit
it has combination of hrc fuse and a switch unit with different ratting.
when any short ckt hrc fuse is blown and its control ckt and power contactor trip with help of bmr,earth fault relay,ct operated relay,or any type of digital rlay. but in some cases switch unit not trip
it is a old model.
now a days mccb used.
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