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Old 3rd July 2012, 06:55 PM   #1
alibear is offline alibear  United Kingdom
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Hi all, whats the general opinion on fuses in the plus and minus rails?
Is it OK to just rely on fuses in primaries of the mains transformer, or does safety dictate that the rails should have fuses too.
The amplifier I'm (still ) building is a KSA50 clone biased at 1.7A it has loudspeaker protection PCB after the output.
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Old 3rd July 2012, 07:01 PM   #2
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In split power supplies, I justify it, but in single rail, definitively no.
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
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Old 3rd July 2012, 11:59 PM   #3
Bonsai is offline Bonsai  Europe
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I would include fuses in the rail on safety (fire) and PCB damage limitation in the case of catastrophic failure.
Amplifier Design and Construction for MUSIC!
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Old 4th July 2012, 12:41 AM   #4
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Better to be safe than to be sorry! as long as they are the appropriated amperage, I would use fuses in the + and - rails for sure.
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Old 4th July 2012, 02:02 AM   #5
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And the rail fuses should be fast-acting, unlike the mains fuses, because they'll never see the inrush current your mains fuses will see.
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Old 4th July 2012, 02:14 AM   #6
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Thanks ByronInLawrence I forgot about it lol. yes, they should be fast acting.
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