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SFU is Switch Fuse Unit. It is basically a switch with stationary Fuse.
Fuse blows out when the current exceeds limit and protects the
equipment from damage. SFU is made from M.S. Sheet 1.6 mm
with 300 A Switch, 250Amp.,200 amp Switch, 250A HRC Fuse Base
3 Nos., Neutral Link with power coating with Fuse Link