[time-nuts] 10811 Thermal fuse?
kb8tq at n1k.org
Wed Sep 3 07:33:59 EDT 2014
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.
On Sep 3, 2014, at 5:29 AM, David McGaw <n1hac at 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.
> 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.
>> 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.
>>> 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.
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