I worked on a project which made use of resettable fuses a decade ago, one observation I recall is that once the resettable fuse trips for the first time, subsequent trips become more common i.e. they require less heat to trip following the first trip even if you've allowed them to cool down following the initial trip.
Valuable info! Thank you for doing the tests and posting this video. I noticed these polyfuses installed in series inside AA battery holders in Snap Circuits electronic toy sets. If a kid makes mistake and shorts the circuit, it will cut off the supply after a moment, and then reset itself for the next project. That's just one example of a practical application.
Nice exponential voltage drop. I'll be using polyfuses in a bunch of projects, learning about that stuff right now. Definitely interesting. And it's even more interesting to know the science behind those parts. Thanks for filling me in :).
I am learning electricity and electronics on you tube. I learned a lot with your video about PTCs. Thanks posting this for the world to see. Gracias Amigo!
Nice vid that shows me that i was not out of the track! I bought some to do some testing and see if I could use them to protect ampmeter when students use them in parallel! I thought that hold current and trip current were reliable infos but obviously not! They are far away to work as fuse! Do you have any idea of other type of electronic parts that would REALLY acts as resettable fuse?
Do atc car resettable Fuses trip too in about double the printed rating on the Fuse or exactly on the printed amp rating, like the normal non reasonable Fuses ? 🤔
wish there were fast blow resettable fuses available in the market. 10 s for trip is just way too long and replacing fast blow fuses (SMD ones) is just pain in tha a**.
Very helpful video. I've been looking for a component to stop current being taken from battery source number one, which is used only to power my device microprocessor and charge battery source number two. When a high load is taken from battery source number two I don't want any current being taken from Battery source number one. If I use one of these with a diode it should do the job. Battery number one rated at 12.8vdc and 3Amp Battery number two has a load that would potentially draw 40 Amps. Now to find a fuse suitable
Nice video but I have a question. At 12:50 on the video, on the top left of the data sheet for the actual part, the electrical rating is specified as being 72V max and a current of 40 amps max. With a device that rips at around 500mA what is the 40 amps all about? Is that the maximum instantaneous current at the moment of a dead short?
Yes that is a bit confusing. i'm not sure how they determine them. obvious that a typical application would never come close. I read those as the part will blow up if you go over the max rating
I have one in a passive cross over for one of my speakers and found it was tripping. I'm not sure where to look. could it be the fuse itself? The speakers ohm out ok and sound fine until it trips.
@@IMSAIGuy ok thank you. Its not exactly an old speaker about 10 years but I believe one of the caps is failing when warmed up. I ordered them I'll have to see if it fixes it.
Different types of fuses for different applications. One time use / replaceable fuses have been available in slow-blow and fast blow for 50 years or more. The poly fuses are a nice option that allows some excesses short term without the inconvenience of having to replace it.
I worked on a project which made use of resettable fuses a decade ago, one observation I recall is that once the resettable fuse trips for the first time, subsequent trips become more common i.e. they require less heat to trip following the first trip even if you've allowed them to cool down following the initial trip.
Valuable info! Thank you for doing the tests and posting this video. I noticed these polyfuses installed in series inside AA battery holders in Snap Circuits electronic toy sets. If a kid makes mistake and shorts the circuit, it will cut off the supply after a moment, and then reset itself for the next project. That's just one example of a practical application.
Nice exponential voltage drop. I'll be using polyfuses in a bunch of projects, learning about that stuff right now. Definitely interesting. And it's even more interesting to know the science behind those parts. Thanks for filling me in :).
Really helpful: helped me chose a resettable fuse value for my power supply project.
I am learning electricity and electronics on you tube. I learned a lot with your video about PTCs. Thanks posting this for the world to see. Gracias Amigo!
De nada
Thanks for this useful video.
Nice vid that shows me that i was not out of the track! I bought some to do some testing and see if I could use them to protect ampmeter when students use them in parallel! I thought that hold current and trip current were reliable infos but obviously not! They are far away to work as fuse! Do you have any idea of other type of electronic parts that would REALLY acts as resettable fuse?
circuit breaker, but they are slow also. other than a fast blow fuse, you would need to add a monitor circuit that acts quickly
Serms almost like a semi linear increase in resistance as current increases...
Good video. Use pptc with crowbar circuit.
Do atc car resettable Fuses trip too in about double the printed rating on the Fuse or exactly on the printed amp rating, like the normal non reasonable Fuses ? 🤔
those are breakers, different technology
wish there were fast blow resettable fuses available in the market. 10 s for trip is just way too long and replacing fast blow fuses (SMD ones) is just pain in tha a**.
Excellent video!
Very helpful video.
I've been looking for a component to stop current being taken from battery source number one, which is used only to power my device microprocessor and charge battery source number two.
When a high load is taken from battery source number two I don't want any current being taken from Battery source number one.
If I use one of these with a diode it should do the job.
Battery number one rated at 12.8vdc and 3Amp
Battery number two has a load that would potentially draw 40 Amps.
Now to find a fuse suitable
Nice video but I have a question. At 12:50 on the video, on the top left of the data sheet for the actual part, the electrical rating is specified as being 72V max and a current of 40 amps max. With a device that rips at around 500mA what is the 40 amps all about? Is that the maximum instantaneous current at the moment of a dead short?
Yes that is a bit confusing. i'm not sure how they determine them. obvious that a typical application would never come close. I read those as the part will blow up if you go over the max rating
I have one in a passive cross over for one of my speakers and found it was tripping. I'm not sure where to look. could it be the fuse itself? The speakers ohm out ok and sound fine until it trips.
if the speaker is old, I would suspect a bad capacitor somewhere
@@IMSAIGuy ok thank you. Its not exactly an old speaker about 10 years but I believe one of the caps is failing when warmed up. I ordered them I'll have to see if it fixes it.
Great!
What is the manufacturer part number of polyfuse component?
I show the datasheet at 12:50 RXEF050
great video. i'll sub.
It's too slow it's not working as fuse
circuit breakers are very slow also. there are lots of time constants for fuses. Some designs use a resistor.
Different types of fuses for different applications. One time use / replaceable fuses have been available in slow-blow and fast blow for 50 years or more. The poly fuses are a nice option that allows some excesses short term without the inconvenience of having to replace it.