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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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    Part 2 may be helpful.

    Switch: "A device designed to make or break the current in one or more electric circuits."

    That only needs to break the line conductor.

    Isolator: A switch which isolates a part of the installation.

    Isolation: "Function intended to make dead for reasons of safety all or a discrete section of the electrical installation by separating the electrical installation, or section thereof, from every source of electrical energy."

    So that is more than just switching. The neutral (if any) also needs to be disconnected.

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  • 0

    Part 2 may be helpful.

    Switch: "A device designed to make or break the current in one or more electric circuits."

    That only needs to break the line conductor.

    Isolator: A switch which isolates a part of the installation.

    Isolation: "Function intended to make dead for reasons of safety all or a discrete section of the electrical installation by separating the electrical installation, or section thereof, from every source of electrical energy."

    So that is more than just switching. The neutral (if any) also needs to be disconnected.

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