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| FUSE Size |
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| 001:
Hi I see different MAINS fuses 20mm 30mm 38mm 60mm How to choose correct size? |
| Zero999:
Presumably you're designing a new project, rather than simply replacing a fuse? What are your requirements? Generally physically larger fuses have higher breaking capacities, than smaller ones, but that's a generalisation. |
| wraper:
Generally 5x20mm fuse is fine. If there will be current higher than 5A for prolonged time, it's better to use 6.3x30mm, If over 10A current for prolonged time, then 10x38mm fuse. This suggestion is valid if fuse is placed in socket. Due to heating, over time surface of fuse terminals and socket may oxidize severely and thus further increase heating (higher resistance/dissipated power) causing chain reaction. I've seen this happening in industrial furnaces. If the fuse has leads or high current flows only temporarily, not causing fuse running hot, smaller size can be used reliably. If high current is applied for prolonged time, fuse holder quality is essential as well. I've seen many of those failing spectacularly. |
| wraper:
That was suggestion based on current rating. Breaking capacity Hero999 mentioned might be important as well. But in that case you can simply look into datasheet. |
| 001:
--- Quote from: wraper on November 06, 2018, 09:52:33 pm ---That was suggestion based on current rating. Breaking capacity Hero999 mentioned might be important as well. But in that case you can simply look into datasheet. --- End quote --- Is it for Arc prevention? Why do You say "Current"? May be You mean "Voltage"? :-// |
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