PTC Thermistor for doorbell?

[BradC]

And set a counter such that 5 presses in quick succession applies 15kv to the metal surrounding the switch.

[floobydust]

My setup is pretty standard using a Heath Zenith 8V/16V/24V transfomer. I have a feeling this has a built-in fuse, which means maybe using the thermistor with the transformer may not do much since it's internal fuse may blow before getting too hot? Maybe the only real option then is to add the thermistor to the doorbell chime solenoid?

Or maybe I'm missing the point and you're saying to add two thermistors; one to the primary and then one to the secondary lines going to the doorbell chime from the transformer? I schematic would help me out since I'm pretty green with these types of components.

Thanks again!

I checked and Heath Zenith (Newhouse china) doorbell transformers are claimed to be "UL Class 2 Certified". SL-125 or 16TR, 40TR etc.
They have overload protection likely a thermal fuse built in per UL 1310 so no need to add fusing.
It's common people upgrade their doorbell transformer, problems where they run out of power with smart doorbells/cams.

But for your stuck button, a PTC will work to stop the coil from burning out.