This appears to be a polyfuse, though it doesn't have the castellations that they normally have each end. There is no visible branding on the top unfortunately; not sure what the likelihood is of something useful being on the other side.
Does anyone have any ideas on who makes it or is it just a chinese generic? What are the chances of being able to identify it from the three digits 823?
Background: It's from the control board in a Bosch tumble drier of about 10 years old. The drier runs until hot and then cuts completely out. After switching off for about 10 seconds, the appliance can be restarted, but switches off again after about a minute. I suspect, assuming that there is not an additional fault, that the polyfuse is simply showing its age, accelerated by the hot conditions in the tumble drier, and is now out of spec. Replacement board is about £160, so replacing the fuse, even if just to test the theory, would be preferred.