Actually, in the unit in which the fuse had opened, it had protected the
unit when the thermistor failed open. Having seen this happen, I
recommend it be replaced. The Panasonic part is 63 cents.
David
On 9/3/14 7:33 AM, Bob Camp wrote:
Hi
In all the years I’ve been doing this, there have been a *lot* of posts and
observations about that fuse failing. The number of reports / observations of
that fuse doing what it is supposed to do (protect a failed controller) have
been virtually zero. By far the easiest “replacement” is a piece of wire. The
risk associated with this fix is near zero. Is it zero - no, but we spend far
more money on these fuses than we would on a handful of replacement OCXO’s.
Bob
On Sep 3, 2014, at 5:29 AM, David McGaw <n1...@dartmouth.edu> wrote:
Let's try this again:
They are HP/Agilent/Keysight PN 10811-80008. I was actually able to buy a
couple from Agilent a few years ago. They are listed as obsolete now. A
Panasonic EYP2BH115 should fit. Newark has them.
David
On 9/2/14 8:05 PM, Dave Daniel wrote:
I believe a thermal cut-out is a device which interrupts the circuit when a
prescribed temperature is reached or exceeded (in some cases by heating from
an increase in current through a conductor), but which re-connects the circuit
once the temperature has dropped below the cut-out temperature (possibly with
some hysteresis built in). A fuse, on the other hand, interrupts the circuit
after a certain current threshold is exceeded (and, of course there is an
increase in temperature related to the increase in current) but which is
destroyed in the process out interrupting the circuit.
DaveD
On 9/2/2014 5:10 PM, Dan Rae wrote:
On 9/2/2014 12:23 PM, Dan Rae wrote:
I'm sure this has been discussed to death before, but does anyone know of a
source of thermal fuses small enough to fit in the -hp- 10811? I have found
plenty of larger ones, none of which will fit and would rather not just link it
out.
Dan
_______________________________________________
Thanks for all the tips and advice.
The Chinese eBay ones (15A) I have bought before and they are physically too
big to fit.
Buerklin is a German distributor and will want 28 Euros to ship to the US.
I know I can link it out, but don't like doing that in something that is
powered on permanently.
I have found some Panasonic ones that Digikey distribute in the US, but
frustratingly the data sheets have no dimensions given. I have ordered some 1A
and 2A ones to try, and will report further.
I suspect that the originals would have been around 115C. And for searching
they seem to be called Thermal Cut Outs (TCO), not fuses.
Dan
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