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Component labelled FB4

Component labelled FB4

Component labelled FB4

(OP)
Hi all,

Troubleshooting a circuit board.  Have several unmarked blank flat square SMT components labelled FB#  such as FB4, FB5, etc.  All others on this board read dead short.  One reads open. When I bypass this component with a meter in amp mode, all the boards power passes through this, about 500ma - and the board turns on and works as expected.

I suspect FB4 is a fuse.  However there exist other components that are labeled F# (F1, F4, etc) that are obvious fuses.

Has anyone seen this notation denoting an ordinary fuse before?  Perhaps this is just to differentiate the SMT from the more ordinary fuses?

RE: Component labelled FB4

"FB" may be : 1) Slow "Blow" SMT fuse
              2) bel fuse [of bel.inc manufacturer of Surface Mount Bel Fuse]

 

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