I had a component in a sizable power supply open up, but I haven't had any luck identifying it. The PCB is marked with this symbol under the component: (two terminals, one on on each side)
I never saw this thing before it failed, but it looked exactly like a failed MOV after it failed (burnt up gray disk with leads flat on each side).
However, the component is wired in series with the AC line input, on the opposite AC line from a fuse. I've never seen any varistor used like this.
The power supply does not work with this component open, but I tried jumping across the two leads, and the power supply came right up, so it was clearly carrying current before.
So what is this?
Edit: Here is how it appears in the circuit:
Best Answer
It's a thermistor. It's almost certainly of the negative temperature coefficient type and being used to limit the inrush current when the device is switched on.
There are (too) many different thermistor symbols in the wild besides the IEC one. Your symbol looks like the old Japanese Industrial Standards symbol for thermistors, except for the odd blob attached to the side.