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.

Parents
  • If the fuse(s) remain connected to the supply side, how do you change them?

  • It is perfectly possible to design a fuse holder where you can take the fuse but leaving the bits that were serving as contacts to it live, and not have that exposed to touch, A switch part is not a requirement to be able too change the fuse

    I have never been a great fan, but at least one design of house cut-out achieves this in that the fuse comes out  on carrier, and leaves finger contact-able  live metal behind, EXAMPLE - no upstream switch needed.

    Mike

Reply
  • It is perfectly possible to design a fuse holder where you can take the fuse but leaving the bits that were serving as contacts to it live, and not have that exposed to touch, A switch part is not a requirement to be able too change the fuse

    I have never been a great fan, but at least one design of house cut-out achieves this in that the fuse comes out  on carrier, and leaves finger contact-able  live metal behind, EXAMPLE - no upstream switch needed.

    Mike

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