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The Information Guidance for Pptc 203

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Find out How to Write Down the Pptc 203

Today we'll have a look inside my little fuse storageAs you can see:Several different typesAnd you might want to deploy these if you're not planning to burn down your houseThis is a classic fuseas you can seethere is a wire insidewhich will melt on fault conditionsthis causes to circuit to be interrupted and protects the deviceThere is one catch: You can use this fuses only a single timeOnce it's blown you have to replace itThats somewhat easy on this automotive typeand also glass fuses like 6x30 or 5x20 are usually no problem to replaceThis however will get a bit tiresomeThse 315mA-guses are soldered onto a printed circuit boardIf these blow you can only replace them using your soldering iron - you may want to prevent this from happeningAnd lets not start to talk about SMD-fuses like this 1206-typeReplacing this type requires a quite steady handSo how can we prevent replacing fuses on every fault?We can use circuit breakersI showed their inner workings in a previous videoIf they trigger you just have to switch it back on using the leaverBut on comparison: There is a obvious size differenceThere is however a device in between - and that's what we'll have a look todayThe so called "PPTC"You might have noticed another device name in this abbreviation: PTC"Positive Temperature Coefficient"A device which will increase its resistance when the temperature risesPPTC means Polymeric Positive Temperature CoefficientSame concept but optimized to serve as fuse replacementAs such the resistance features a very steep rise at the target temperatureDepending on your supplier the devices are sold using different names:PFRA, Polyfuse, Polyswitch, Multifuse, Everfuse, etcThe advantage? It is temperature-drivenSo there is no wire to melt but a heat-sensitive polymerWith increaing current the device heats up and will reach a very high resistance - the fuse is "blown"However: If you clear the fault the device will slowly cool down and reduce its resistance - the fuse turns itself back onA big advantage in places where faults are likely to occurprominent example: USB-hubs. Broken or improperly plugged in devices may short portsIf you remove the device the port will however resume operation once its PPTC has cooled downThere are however several limitations if you campare against a classic fuseA melted wire leaves a gap which insulates the circuitsIt can break high currents in a short period of time, a PPTC is inferior looking at these parametersThey are usually rated for 40V or 60V maxAnd this 900mA fusecan propably not break more than 30-40A fault currentfurthermore the breaking is based on temperatureso the device has to heat up firsta 900mA-fuse might take 10 to 15 seconds to reach it's target temperatureand breaking the circuitthis time of course varies depending on the applied loadwe also should not forget: Its a resistoreven if it's cold there is - in this case - about 200-300mOhm resistancea thing you should consider before passing higher currentsAlso, since everything is based on temperature, the rating is more of a basic indicationwhich can vary depending on the environmental temperatureso if your device is operating in a cold environmentlet's say about -40°Cthe current and time needed to trip the fuse will of course increase a lotBut what about cost?classic fuses like 5x20 glassgo for about 3€ per 100pcs wholesale. PPTC are about 7€ per 100pcsglass fuses with ceramic filling cost slightly less than PPTCsso they are on the expensive side, but you shouldn't forgetthey can mostly be used multiple timesLets look at a datasheet, here provided by SchurterI mostly buy from this vendor, the 900mA shown before was however a noname product.The parameters should however be in the same ballparkhere are the thermal ratings900mA is the reference hold current at 23°Cif we've got 0°C however it rises to 1,07AAt 40°C it can only take 330mA - higher temperatures result in lower currentscooler as such in higher hold currentsFor the electrical side our 900mA-fuse should takeup to 60V and is able to break faults up to 40AIt will start to reliable trip at 1.8A - double the hold currentalso we can see the resistancewhen cold we have to expect between 140 and 310 mOhmafter one hour at holding current about 470mOhm - nearly half an Ohm!the trigger time is specified at 4.5Ain this case it takes about 7.2 until the PPTC triggersIf we take a look at larger fusesfor example at 11A we're no longer talking about 7 secondsbut 20 seconds until it breaks the circuit.The larger we go the longer it takes to triggerThere isn't much to say about the insidesWikipedia talks about a solid body constucted out of a temerature-sensitive polymerprimed using basic carbonLet's take the easy desciption: a plastic-soot-mixSo let's test it: I've got a 900mA PPTC connectedso we can hold 900mA continuouslyit's connected to my electronic load, currently set at 0.2mAAlso there are two LEDs, the red one is connected directly to my power supplythe yellow one is connected behind the PPTCso we can see if the PPTC has switched offSo, let's startAs you can see: Everything somewhat cool. A 37°C spot over herebut that's the boards power supplyso lets go to the maximum, 900mA, and see what happensAnd run. The led dims due to the voltage drop1I increase the voltage to get it back on1We see the PPTC is slightly warming up1you can see the screwdriver moving over the PPTC1We should be able to run this continously so let's wait a view minutes1We see the red LED is no longer lit - I guess the voltage was too high and it broke1but the output voltage and LED are OK, so I guess that should be enough19 minutes later - PPTC is at about 41°C and looking stable1I'll wait another hour11 hour later - no real change1we are still at stable 41°C1So let's have a look at higher currents1Let's double the current, from 900mA1to 1.8A1and let's see how long it takes to trigger1so we reconfigure the load to take 1.8A - and run1And as we see and hear the fuse has trigggered1PPTC is at 88°C and was reasonably fast1I guessed it would take more time to heat up1So lets reverse the process and turn off the load1Load is off, the temperature is slowly decreasing1and after a short while the LED turns back on - all by itself1If we turn the load back on it'll trigger again1So we can conclude: The fuse works as expected1We can also have a look at the oscilloscope - pretty low speed1each horizontal line is 2.5 seconds1We we start our trace with 13.5V1a voltage you would expect inside a car1and after one box or 2.5 seconds1I turned on a 1.8A load on this 900mA fuse1and we see the voltage is pretty stable at first1but once we reach the target temperature1the voltage drops dramatically - the fuse is triggered1that's the difference to a classic PTC1they usually try to be somewhat linear with temperature1here the resistance changes only slightly at first1you can see a bit of a wiggle indicating a small change1but until we reach the trigger temperature there is no massive change in voltage1once we get there the resistance jumps up1and the circuit is nearly broken1we can see the long part between starting the fault and triggering1so as expected several seconds pass until the fuse triggers1in this case starting at room temperature it takes1about 26.5 seconds to trigger1I think that should wrap up our little look at PPTCs1as said they are limited in voltage1and breaking current and take their time to trigger1so in practice they are mostly combined with other types1for example a PPTC at a user-accessible port1but an additional glass-fuse to quickly break large faults1further back in the system1as long as the fault is not too substential1only the PPTC triggers1and the device magically repairs itself once the fault is cleared1so you don't have to discard the device or replace the fuse1I've shown repairs in the past where standard fuses where the culprit1So it isn't really an oddity to see such faults1and in this cases it would make sense to spend the extra money1to increase the durability1I use them mostly in my solar system1Of course i've got also primary fuses in the distribution1to protect cables from overheating1but i.e. if I've got an LED taking 1A1why only rely on the distribution fuse1which might be sized for 10A1And there I insert an additional PPTC1If something goes wrong the PPTC will shut down the LED, the room itself1is however still working1Of course - we're still talking about heat - you shouldn't place1them near wood, fabric or other stuff that could burn1but the same goes for most electric installations1so keep your distance1But enough rambling, once you know the limitations1they will trigger as you expect, we've confirmed the values1and even though I used a no-name model1it worked as it's supposed to do1What the?! Thas wasn't planned....Just No.

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Pptc 203 FAQs

Here are the answers to some common inquiries regarding Pptc 203. Let us know if you have any other confusion.

Need help? Contact support

Do military members have to pay any fee for leave or fiancee forms?

First off there are no fees for leaves or requests for leave in any branch of the United States military. Second there is no such thing as a fiancée form in the U.S. military. There is however a form for applying for a fiancée visa (K-1 Visa)that is available from the Immigration and Customs Service (Fiancé(e) Visas ) which would be processed by the U.S. State Department at a U.S. Consulate or Embassy overseas. However these fiancée visas are for foreigners wishing to enter the United States for the purpose of marriage and are valid for 90 days. They have nothing to do with the military and are Continue Reading

How can I fill out Google's intern host matching form to optimize my chances of receiving a match?

I was selected for a summer internship 2016. I tried to be very open while filling the preference form: I choose many products as my favorite products and I said I'm open about the team I want to join. I even was very open in the location and start date to get host matching interviews (I negotiated the start date in the interview until both me and my host were happy.) You could ask your recruiter to review your form (there are very cool and could help you a lot since they have a bigger experience). Do a search on the potential team. Before the interviews, try to find smart question that you are Continue Reading

How do I fill out the form of DU CIC? I couldn't find the link to fill out the form.

Just register on the admission portal and during registration you will get an option for the entrance based course. Just register there. There is no separate form for DU CIC.

How do you know if you need to fill out a 1099 form?

It can also be that he used the wrong form and will still be deducting taxes as he should be. Using the wrong form and doing the right thing isnt exactly a federal offense

How can I make it easier for users to fill out a form on mobile apps?

Make it fast. Ask them as few questions as possible (don't collect unnecessary information) and pre-populate as many fields as possible. Don't ask offputting questions where the respondent might have to enter sensitive personal information. If some users see you collecting sensitive information, they might not be ready to share that with you yet based on what you are offering, and they will think twice about completing the form.

What do I do if I lost my passport in another country?

Get replacement documentation. I was visiting China a couple of years ago and had my passport stolen (the hotel says 'lost', but what's the difference?). I had to report the passport stolen/lost to the local police. You need a passport to exit the country. I was required to go to the US Embassy, to obtain a temporary replacement passport. Luckily, I kept a photocopy of my passport, which expedited the processing time. They were able to process it within two hours. You need to provide them with a photo for the passport. There was fortunately a place nearby to the Embassy where they did imme Continue Reading

When do I have to learn how to fill out a W-2 form?

While I did not study physics this is something that relates to my field as well. One thing to remember is the scope of the field which you are talking about. With physics it might seem narrower than History or Archaeology but I suspect that when you boil it down it isn’t. It would be impossible to cover everything in a subject even going all the way through to gaining a doctorate. The answer you got and posted up is very accurate and extremely good advice. What a lot of it boils down to in education (especially nowadays) is not so much teaching specific facts but teaching themes and how to find Continue Reading

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