Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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RE: Fuse rating question

Posted by sony6060 on July 15, 2021 at 07:25:40:
Fast Blow fuse, use 2x current draw. Slow Blow fuse, use 1.25 times the current draw. Fuses can operate up to 1.5x the fuse current rating for up to 20 minutes.
Personally, I use Slow blow at as close to current draw as possible with capacitor input power supplies. Choke input power supplies not having a high input charging surge, I use Fast Blow at as close to current rating as possible. Never had a fuse fail.