why might one use a fuse-switch isolator instead of a switch-fuse isolator - what really is the definitive difference ?

good morrow

as per the 'subject' - when might one be used over the other and construction wise in an enclosure, what is the difference* ?

seperate to that, is it important to have the supply on the moving pole of the switch or the fixed side (if that makes sense) ?

the symbols are different too between the two types  - one appears to show the fuse on the angled line of the switch where as on the other, it is on the horizontal line seperate from the switch.

the internet seems to not have an answer - at least on the basis of carrying out a nano-second search ;-)

thank you

*  is the only difference being that the fuse also protects the switch, in a fuse-switch isolator...

edit: no idea what i typed but edited the symbols sentence to read 'between the two types', which it wasnt originally

edit2: rather bizarrely, the * sentence was erased to be replaced by 'edit spelling' ...  i didnt erase the original entry there.  strange.  ive put it back as it was near enough once noticed. sorry.

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  • In my experience the fuses are part of the moving mechanism in a fuse-switch whereas in a switch fuse they are stationary.  I suspect that the definition is manufacturer dependent though.  Moving fuse carriers can often mask live contacts giving an air of added safety not that this should be taken for granted as some mechanisms are quite flimsy.

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  • In my experience the fuses are part of the moving mechanism in a fuse-switch whereas in a switch fuse they are stationary.  I suspect that the definition is manufacturer dependent though.  Moving fuse carriers can often mask live contacts giving an air of added safety not that this should be taken for granted as some mechanisms are quite flimsy.

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