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Radio fuse

J

JimS

Member
My radio, an old Blaupunkt, has two double auto type glass fuses in line. One of them has blown. Is it necessary to have two in line? May I wire the blown one out?
 
First, my disclaimer: Not real sure about that radio but I have seen something different on these

Make sure that is a fuse to start with. There are some of the old radios that use a lamp that looks just like a fuse. Some higher end speakers use these as well. As power increases, the lamp glows a bit and limits the current in that circuit. It acts like a fuse and looks like one, but it's more like an electronic "shock absorber". This may not be the case on your radio, but worth looking into. Google the model number and see if you can find a manual.
 
Some of those radios also have a fuse in the speaker output line to protect the amplifier. Be vewey vewey careful.
 
If this is something you want to keep, and keep working, go back withe the proper fuse.

If it's an old beater, don't care if it dies, it dies, then bypass it.

If you decide to find a fuse, be sure to also match the voltage stamped on the fuse. The automotive fuses are 32 volt, appliance fuses are 125 or 250 volt. There are also slow-blow and fast-blow fuses. It makes a big difference!
 
NO reason a 125 or 250 Volt fuse CAN'T be used in a 12 Volt system.

Amps are Amps.

On the other hand, using a 32 Volt fuse in a line-voltage application would NOT be a good idea.
 
The only reason I can think of by them having two fuses inline/series of each other is assuming one of them might not be able to open in the event of an overload or short. Often times both of fuses will blow at the same time anyway. Using one fuse will be just fine, just stick to the rated amperage

The voltage rating of a fuse should always be matched or higher but never lower. Its not something to be concerned about with 12v though. The reason for voltage rating is to prevent arcing when the fuse blows. Using a low voltage fuse in a high voltage circuit might allow the high voltage to arc across the open fuse contacts.
 
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