Who makes those combined polyfuse/TVS overload protectors?
I accidentally blew up a box that was protected by a polyfuse followed by a transzorb. I applied 24 volts to a 15-volt box, and the power supply current limited just below the polyfuse trip current, so I toasted the 15 volt transzorb. That's improbable, but not nice.
If the transzorb heated the polyfuse, it would be safer. I think someone makes that, but I don't recall who.