What is supplying the power? I would expect a power supply to have current limiting, possibly even foldback current limiting, which means that the current drops to a low level when there is a short.
Still not defined, but I would probably use a Meanwell power supply such as: MEANWELL LRS-150-24 150W 24V Switching Power Supply
My issue is really finding something that reliably and indefinably “switches off” when there is a short, and “switches on” automatically when the short is absent.
You mention 24 volts and make no mention of the current? I also suggest standing by with a good fire extinguisher if anything burning down is even a remote possibility.
Definitely, the fire extinguisher is there ; ).
I would like to experiment a bit with the current, but something around 5 to 10A are more than enough. Sorry for the lack of info initially…
You can generate impressive sparks by short-circuiting a large, charged capacitor. This has the advantage of an inherently limited and very short duration. The spark intensity will depend upon the voltage and the size of the capacitor, so it’s something you can control experimentally. Sparks from discharging large caps in this manner can definitely start fires, so you’d want to exercise due caution and use the smallest cap consistent with whatever it is you’re trying to achieve. The cap is charged between shorts through a resistor or its internal current limiting.
Whether or not this has any relevance to what you’re doing depends on what you’re trying to accomplish… which is unclear.
This sounds really interesting. Even though I’m going to experiment with it, for my current application, it won’t work. The two ends I’m using to produce the brief spark are a copper plate and a copper rod, and they cannot be changed at this point.
Sounds like an xy problem.
It appears what you’re really trying to do is create a spark (but you ask for short circuit protection). A great way of doing that is indeed by charging a cap and then shorting that out. This cap can be charged through a resistor from the power source, or if you borrow the circuit of a mosquito swatter it’s simply the available power that stops the wires from melting.
If you really just need short circuit protection, there are many options for that, depending on a.o. what current level it should activate.
In this case it was really just about the reliable and automatic short circuit protection. Would you have a recommendation for a circuit that could: a) protect reliably a 24v / 5-10A circuit b) turn “on and off” automatically- meaning, when there is a short circuit, it brakes the circuit; when there is not, it closes it.