Answer / k.prakashchandra

SFU =Incomer> switch >fuse> load unit, FSU =Incomer> fuse>
switch > load unit.Actually FSU is better as it protects
against fault in switch also.SFU is preferred if bare open
fuse wires are used, as fuses can be replaced without
opening at the origin.FSU is preferred when Cartridge type (
HRC)fuses are used.

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