Micro fuse?

englishpremier · 16 Jun 2011 at 12:06

Well i searched for HP w2207 and that's the pic that came up and from memory it seemed similar. They did release 2 updated models though.

No the fuse is not 10mm - the highstreet electrical components retailer i visited had 10mm fuses in and they were too large.

It's 5mm

Edit: or are you saying i'll get away with soldering a 10mm one in there? I would have thought the resistance would be different

Mick-1965 · 16 Jun 2011 at 12:28

Look at your ruler its clearly 10mm.

And yes any fuse rated and 2.5 A would do, Fuses effectively have no resistance. They have a current rating at which they will blow.

Phenomenologica · 16 Jun 2011 at 17:24

That fuse is 5mm. The tape measure is just closer to the camera. Your other picture, however, was clearly a 20mm fuse and arguing otherwise was a little unhelpful, since we logically assumed you took the picture.

Also, Mick, how do you think the fuses blow if they have no resistance? It's a bit of wire designed to heat up due to its resistance and melt at a certain current. I wouldn't think the size of the fuse is relevant, because the wire inside will be rated to melt at a set current and voltage, regardless of the size of the casing. Most fuses are 20mm for convenience of handling, I imagine.

Surveyor · 16 Jun 2011 at 18:03

Phenomenologica said:
Also, Mick, how do you think the fuses blow if they have no resistance? It's a bit of wire designed to heat up due to its resistance and melt at a certain current. I wouldn't think the size of the fuse is relevant, because the wire inside will be rated to melt at a set current and voltage, regardless of the size of the casing. Most fuses are 20mm for convenience of handling, I imagine.

Mick is correct.

A fuse consists of a thin metal wire of low resistance and low melting point.

When electrical appliances are faulty there'll be an excess electric current through the circuit which causes melting of the fuse.

Phenomenologica · 16 Jun 2011 at 18:23

Surveyor said:
When electrical appliances are faulty there'll be an excess electric current through the circuit which causes melting of the fuse.

But the only reason the fuse will heat up is due to its resistance to the current. I'll concede they probably don't have much resistance if the melting point is fairly low, but surely 'effectively no' resistance is pushing it?

Mick-1965 · 16 Jun 2011 at 22:57

Phenomenologica said:
That fuse is 5mm. The tape measure is just closer to the camera. Your other picture, however, was clearly a 20mm fuse and arguing otherwise was a little unhelpful, since we logically assumed you took the picture.

Also, Mick, how do you think the fuses blow if they have no resistance? It's a bit of wire designed to heat up due to its resistance and melt at a certain current. I wouldn't think the size of the fuse is relevant, because the wire inside will be rated to melt at a set current and voltage, regardless of the size of the casing. Most fuses are 20mm for convenience of handling, I imagine.

Got our pedantic head on eh....

Bad choice of words if you want to look at it finely. How about "almost nearly"
The point was, the resistance is un-important and the fact that a 2.5 amp fuse, whether it be 10mm, 20mm or even 38mm, is design to blow at 2.5 A.

Also as you are sure that it is only 5mm long, I take it you have seen it. Would you mind posting a picture of the fuse sitting on top of the rule.
Again I can only tell you what I see from the images given and 10mm is what I see.

Phenomenologica · 17 Jun 2011 at 09:13

All of my heads are pedantic.

And from the picture it looks to me like the measure is sitting on top of a metal heat sink/divider so is a centimetre or so above the board, which at this scale would fudge up the perspective. So I'm inclined to believe it's 5.

inSilica · 17 Jun 2011 at 09:16

inSilica said:
A picture would be great

The regular ones your are talking about are actually 25.4 mm in length:

I know you say its 5mm in total length, do you mean width by any chance , these are 5x20mm:

http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5371054

otherwise it could be one of those nasty HRC fuses. there alien to me.

http://www.google.co.uk/search?q=hr...&source=og&sa=N&hl=en&tab=wi&biw=1066&bih=760

if all else fails, you could try something like:

http://uk.farnell.com/jsp/displayProduct.jsp?sku=1162752&CMP=e-2072-00001000

or just get a 2.5amp rated 'wire' (yes its just a naked wire rated to break/melt with surge > 2.5amp) and attach to connectors using solder or if you prefer some tiny crocodile clips

meh... I stand by getting either the farnell solution or naked 2.5amp rated fuse wire

PiKe · 17 Jun 2011 at 09:25

Surely there's a reason why the fuse blew in the first place?

Mick-1965 · 17 Jun 2011 at 09:45

Phenomenologica said:
All of my heads are pedantic. And from the picture it looks to me like the measure is sitting on top of a metal heat sink/divider so is a centimetre or so above the board, which at this scale would fudge up the perspective. So I'm inclined to believe it's 5.

It then begs the question, why post another misleading image.

To me it looks like the rule its sitting on top of that chip in the top left. which is approx 3.5mm high, same height as a 10mm fuse, so perspective should play no part.
Besides from experience, the only 5mm fuses I've come across/used are surface mount type. But you never Know with manufacturers these days, I maybe wrong.

englishpremier · 17 Jun 2011 at 14:15

PiKe said:
Surely there's a reason why the fuse blew in the first place?

This.

I tried just naked 3amp wire, but it blew and tripped my electric.

The monitor will be going in bin and i'll be stuck with a 17" one.

inSilica · 17 Jun 2011 at 14:40

oooooo .... yea wise choice, better monitor dead than you !, something else is dead on there, maybe a capacitor or resistor somewhere which would be a ** to find, careful you dump it ethically though :-)

, last thing you want is a bollocking from the council, local dump yard would take it free of charge