"Phil Allison" wrote in message
...

"Tony Hwang"

I understand they work on bi-metal strips.


** Nope - that is a temperature switch.

Thermal fuses like this one use the melting point of some material and
rely on a spring to open the circuit.

http://media.digikey.com/photos/Cant...1%20DF100S.jpg



.... Phil



This is the type Peavey have hidden in the mains transformer of the Classic
30.
I only discovered it by accident when I decided to dissect an "open circuit"
one, no mention in the schematics AFAIK.

The owner had had 2 mains transformers replaced previously, seems, from
Googling, these transformers are woefully underpowered and often break.
Wonder if the only failing part is actually this switch?


Gareth.