bigclive
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Tesla miracle heater PTC heater overheat test
🕑 Added 2025-11-12 00:47:34 +0000 UTCA simple test of how the PTC heater block behaves in a total failure situation. In reality, this situation would require a processor crash or triac failure to achieve. If everything was otherwise intact the internal thermistor should sense the build up of heat as "room temperature" and shut the heater off.
Comments
Big Clive
I think they rely on the inherent thermal limiting of the PTC element and vicinity of the internal thermistor.
Charles
Huh, interesting. I saw there was no "tilt switch" in this - are those not required for portable heaters in the UK? They're common here, and are supposed to shut the thing off if it falls over on its side (or worse, heat side face-down). Sometimes it's a literal tilt switch (the ball bearing type, I'm guessing, in these mercury-paranoid times), sometimes it's just a microswitch pushed by a plastic pin that pokes out the bottom. If it falls over, a spring pushes the pin out and it opens the microswitch.
Mike Page
Good test, thanks Clive.
