Is it 3/4 (0.75 times) or 4/3 (~1.5 times)?
I don't have an adjustable bench top power supply so I use THESE and repurposed 19V laptop chargers
They have an adjustable current limit 5V USB output. You can current limit it down to the mA if needed. I find them very versatile with many uses.
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75% of 30,000mAh = 22 Amp (maximum) will give some headroom.
However, if the current taken was 10A there would be no need to use a 22A fuse when a smaller fuse would work i.e. 15A
Yes, an electronic current source set to some maximum, or even foldback current limiting.
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I don't know for sure but I imagine cost and reliability. Fuses are cheap and reliable, circuit breakers are expensive and, perhaps, not so reliable. Car fuses rarely blow, and if they do something probably needs fixing.
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I think this has been answered, if not then it would help to ask another related question to clarify whatever it is you still need explaining.
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These are set to a constant voltage (CV) until the set current limit is reached. Then they go into constant current (CC). At that point the voltage folds back while the current stays at its setpoint. The voltage doesn't cut out like a crowbar or LDO regulator. This can cause problems with certain circuits.
Even with that in mind, they are useable over-current protection devices. I won't say it can replace a properly sized fuse in any application but probably could have saved Delta_G's board.
I think I answered the second one and possibly the 1st and 3rd of those, if my answer didn't help then please clarify what you don't understand about my reply.
They do serve a purpose, they stop the wires from going up in smoke and possibly setting the car on fire in the event of a short circuit.
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My reply #16 was in response to your #14 where you mentioned car batteries and lipo batteries, both of which can generate enough current to quickly make wires hot enough to start a fire. In the case of lipo batteries there's the added risk of the battery itself catching fire. So in either case I'm saying always use fuses for these types of battery.
Fuses are primarily there to protect the wiring and the power source. In many cases there are components in the circuit that will overheat and catch fire at currents lower than the supply wire is rated for. In that case, a fuse is selected that will tolerate the amount of current needed by the circuit and still provide some protection against overheating in case of a fault.
Nothing would have prevented the vaporization of that laughably thin trace joining those two ground pours. When you replace it with a piece of wire you will probably find the next weakest link although nothing will save the circuitry from a short in the headset.
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I answered this in reply #10, others have also covered it.
You can't expect a tutorial to just appear as a response to a request like yours. This topic was never going to be a tutorial, but it might, hopefully contain enough relevant answers to give you the information you wanted, and it might prompt someone to write a tutorial. Good tutorials take weeks to write.
If you really want to learn about fuses challenge yourself to write the tutorial you are asking for.
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Let me rephrase. A fuse would not likely have blown fast enough to prevent that damage.
Maybe, maybe not. I don't feel fired up to write it. There are not many people who bother to write tutorials, even fewer who write really good tutorials. Mine were all based on things I found myself answering a lot, and I feel I've run out of things I want to write about, sorry.
Frankly speaking (at the first reading of the thread title), I thought about MCU fuses as this Forum is predominently dealing with Arduino affairs; but, the thread is discussing on Electrical Fuses. Can the title be edited to:
Tutorial Request : Electrical Fuses?
So do some research using this topic as a starting point. If you can find out enough to write a good tutorial you will have taught yourself everything you need to know.
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OP is very clear in his saying that someone with EE (Electrical Engineering) background and experience may take the initiative of preparing a Tutorial on Electrical Fuses.
Does anyone but me remember the spools of fuse wire that was used to repair fuses?
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Yes, we used that in the olden days.
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They are still used and I have seen it recently for the Power Company to bypass the 11 kV blasted dropout fuse in our Apartment Complex (as a temporary measure).
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