Fuses
- Thread starter dan316
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bphgravity
Senior Member
- Location
- Florida
Re: Fuses
Many fuses, but not all will be dually listed and marked with both AC and DC ratings. Check the product specification of the fuse you intend to use.
Many fuses, but not all will be dually listed and marked with both AC and DC ratings. Check the product specification of the fuse you intend to use.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: Fuses
An important aspect of Bryan's answer is that a fuse's ampere rating in an AC application may not be the same as its ampere rating in a DC application. Don't just grab a 20 amp fuse and think you have what you need. Read what the manufacturer says about the AC and DC ratings.
Re: Fuses
Remember Dan that AC voltage goes through a zero voltage point 120 times a second where DC never does. This must be considered when applying a fuse at it must be able to clear and stop current flow. When the AC voltage passes through zero volts it naturally helps clear the arc within the fuse. With DC there is no such help so if a fuse sis have a DC rating it may be different than the AC rating. Many breaker have DC ratings and have the same problems clearing the arc.
Remember Dan that AC voltage goes through a zero voltage point 120 times a second where DC never does. This must be considered when applying a fuse at it must be able to clear and stop current flow. When the AC voltage passes through zero volts it naturally helps clear the arc within the fuse. With DC there is no such help so if a fuse sis have a DC rating it may be different than the AC rating. Many breaker have DC ratings and have the same problems clearing the arc.
plate
Senior Member
- Location
- South East PA
Re: Fuses
Frequently, the dc voltage rating for a fuse is half its ac rating. To add to what others have already mentioned, the interupting rating will differ by as much as a factor of 10 times less in a dc circuit.
Frequently, the dc voltage rating for a fuse is half its ac rating. To add to what others have already mentioned, the interupting rating will differ by as much as a factor of 10 times less in a dc circuit.
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