Is there a thermistor which has a very low resistance up to about 45°C and then, within a few degrees, raises the resistance to a very high resistance? Sort of like a self resetting thermal cutoff fuse, but with a raising resistance before cutoff.
Asked
Active
Viewed 76 times
2
-
Better to use a thermistor in a bridge with gain to drive FET – Tony Stewart EE75 Aug 20 '20 at 15:06
-
Why do you use a regular thermistor and a comparator with the switching voltage of the comparator set to the thermistors... – Voltage Spike Aug 25 '20 at 21:31
2 Answers
2
Do you mean something like a polyfuse?
Dave Tweed
- 168,369
- 17
- 228
- 393
-
Pretty much exactly like those, but are they somehow bound to "overcurrent-creates-temperature" (from what I've read so far, they are) or do they also react to outside temperature? – Christian Aug 20 '20 at 14:26
-
1Also consider a bimetallic thermal switch. Those are readily available in NC and NO configurations around that temperature. – rdtsc Aug 20 '20 at 14:38
-
PTC’ polyfuses are usually >=85’C but there are many variations – Tony Stewart EE75 Aug 20 '20 at 15:05
1
yes you will need to check out the PRF series from Murata, PTC thermistors for that type of characteristic.
citizen
- 2,241
- 7
- 16