Baron wrote in message
...
N_Cook Inscribed thus:

I have one in front of me labelled
UTM 210-9 25435,3 watt probably Russian and can find no info
Like the standard pillar white/grey ceramic resistors but instead of
the wire returning down the flute of the ceramic there is a sprung
join set in the flute with bismuth solder or something. Anyone know a
generic name for this type of thermal cut out resistor or a maker name
? Other than the opening temperature must be greater than the
sustained power rating temp of the resistor and lower than standard
solder, anyone know what sort of safety cut out temperature?

Woods metal is used to secure the spring ! So about 70C.

--
Best Regards:
Baron.


Must be higher than that, as a rule of thumb or finger I've come across
plenty of in service droppers that are too hot to touch more than fleetingly
which means 70 C or above. Unfortunately my variable soldering iron cannot
go down that low to try this one in front of me. Looks like a lump of metal
with thermometer in it, heated on the stove to check this one