Electronics > Projects, Designs, and Technical Stuff
fuse for 24vac
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Paul Moir:
FWIW I've seen ATO fuses used in 24vac control applications before.  An air conditioning system comes to mind, but I think I've seen some furnaces too.
Zero999:

--- Quote from: coppercone2 on November 02, 2018, 10:46:22 pm ---
--- Quote from: T3sl4co1l on November 02, 2018, 10:38:19 pm ---I would worry more that your wall wart is unable to provide fault current, i.e., it is "impedance protected".  But not necessarily well enough by itself to avoid melting or smoking or burning up, for which the fuse would be nice.

Tim

--- End quote ---

do they have magentics that can be mismatched to the fuse trip characteristic like this? What would be the solution then, thermal fuse on the transformer? I de-rate by habit but in a sense by de-rating your making the fault current worse.

--- End quote ---
It's a tricking one. A fast blow fuse such as the glass cartridge type might work, but it could blow due to the surge taken when the capacitor charges.

I'd be inclined to measure the short circuit current of the transformer using a clamp meter. The transformer should be able to handle the short circuit current for the few seconds it takes to take a reading.
drussell:
It seems james_s beat me to it above, but I as going to mention that the fuses used in typical automotive applications are rated for at least 32 volts (AC/DC).  This includes both the plastic body "blade" type ones, including standard ATO, the mini, micro and MAXI variants, as well as the traditional glass type ones.  Some of the newer high current "plug-in" plastic cartridge types like are used for larger loads are mostly rated 58 or 60 volts.

It would be silly to have a fuse that were only suitable to exactly 12 volts, especially since standard "12V" vehicle electrical systems often see voltages at least several volts above the nominal 12 volts.  :)
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