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From: N_Cook on 18 Jun 2010 10:35
Gerard Bok <bok118(a)zonnet.nl> wrote in message
news:4c1b654d.9662800(a)News.Individual.NET...
> On Fri, 18 Jun 2010 12:56:09 +0100, "N_Cook" <diverse(a)tcp.co.uk>
> wrote:
>
> >When did they first arrive and do they always have an unusual body
colour?
> >There is a patent reference to 1977 but when would the first appearance
in
> >domestic equipment have been ?.
>
> Way before 1977 !
>
> Take a look at radio and TV sets from the late 50s and 60s.
> Big white or beige wirewound resistors in a ceramic housing, one
> of the leads spring loaded along the edge, low temp solder blob
> on the spring to keep the circuit closed.
>
> Designed to cut open when the resistor's body reaches some 200
> degrees Celsius / 400 degrees Fahrenheit.
>
> (I think I can digg up a picture, if you want :-)
>
> --
> Kind regards,
> Gerard Bok


Sorry, I should have said fusible resistors otherwise visually
indistinguishable from conventional 1/3 or 1/2W, MO resistors.
Grey bodied 1/3W and 1/2W Philips ones in a 1992 Farnell catalogue


From: nesesu on 18 Jun 2010 11:28
On Jun 18, 7:35 am, "N_Cook" <dive...(a)tcp.co.uk> wrote:
> Gerard Bok <bok...(a)zonnet.nl> wrote in message
>
> news:4c1b654d.9662800(a)News.Individual.NET...
>
>
>
>
>
> > On Fri, 18 Jun 2010 12:56:09 +0100, "N_Cook" <dive...(a)tcp.co.uk>
> > wrote:
>
> > >When did they first arrive and do they always have an unusual body
> colour?
> > >There is a patent reference to 1977 but when would the first appearance
> in
> > >domestic equipment have been ?.
>
> > Way before 1977 !
>
> > Take a look at radio and TV sets from the late 50s and 60s.
> > Big white or beige wirewound resistors in a ceramic housing, one
> > of the leads spring loaded along the edge, low temp solder blob
> > on the spring to keep the circuit closed.
>
> > Designed to cut open when the resistor's body reaches some 200
> > degrees  Celsius / 400 degrees Fahrenheit.
>
> > (I think I can digg up a picture, if you want :-)
>
> > --
> > Kind regards,
> > Gerard Bok
>
> Sorry, I should have said fusible resistors otherwise visually
> indistinguishable from conventional 1/3 or 1/2W, MO resistors.
> Grey bodied 1/3W and 1/2W Philips ones in a 1992 Farnell catalogue- Hide quoted text -
>
> - Show quoted text -

Don't know about that exact type, but we were using a black coated 5W
axial WW from, I think, Dale and it looked exactly like the normal 5W
axial except the usual number ended in "F". It, presumably, used a
weak point since it fused on overcurrent rather than overheating. That
was back in the early '90s. As mentioned by others, the 'sand coated'
"Fusistors" have been around at least since WWII.

Neil S.
From: N_Cook on 18 Jun 2010 12:18
As far as Philips NFR25 range came in after 1984 and before 1987.
I was trying to gauge what sort of current surge would knock out a standard
MO resistor without leaving any trace of overheating versus a proper 1/3W
fusible resistor if it was likely to be around in 1990.





From: David Nebenzahl on 18 Jun 2010 16:08
On 6/18/2010 7:35 AM N_Cook spake thus:

> Sorry, I should have said fusible resistors otherwise visually
> indistinguishable from conventional 1/3 or 1/2W, MO resistors.
> Grey bodied 1/3W and 1/2W Philips ones in a 1992 Farnell catalogue

What's "MO"? Never heard this term applied to resistors before.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)
From: David Nebenzahl on 18 Jun 2010 16:09
On 6/18/2010 1:08 PM David Nebenzahl spake thus:

> On 6/18/2010 7:35 AM N_Cook spake thus:
>
>> Sorry, I should have said fusible resistors otherwise visually
>> indistinguishable from conventional 1/3 or 1/2W, MO resistors.
>> Grey bodied 1/3W and 1/2W Philips ones in a 1992 Farnell catalogue
>
> What's "MO"? Never heard this term applied to resistors before.

Hmm, let me guess at my own question: metal oxide?


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)
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