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

psychicwarrior

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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    I think one needs to read the data sheets carefully, and then think about the end use, I fear that what means in practice can be rather like Alice in Wonderland.

    When I use a word,' Humpty Dumpty said in rather a scornful tone, 'it means just what I choose it to mean — neither more nor less.


    It may mean that the switch isolates the fuse holder, or that removing the fuse isolates the switch. It may not.
    Isolator, switch and disconnector are defined in the degree of safety and the ability to open under load or fault .
    But if 'fuse' precedes or follows in the language and is the same electrically is probably a bit of a lottery.
    Mike.

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    I think one needs to read the data sheets carefully, and then think about the end use, I fear that what means in practice can be rather like Alice in Wonderland.

    When I use a word,' Humpty Dumpty said in rather a scornful tone, 'it means just what I choose it to mean — neither more nor less.


    It may mean that the switch isolates the fuse holder, or that removing the fuse isolates the switch. It may not.
    Isolator, switch and disconnector are defined in the degree of safety and the ability to open under load or fault .
    But if 'fuse' precedes or follows in the language and is the same electrically is probably a bit of a lottery.
    Mike.

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