ATC VS ATO Fuses - www.ifish.net

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Old 02-12-2011, 06:38 PM   #1
SlyHawk
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Default ATC VS ATO Fuses

Thought I would pass something I just learned about fuse types. I have been chasing down electrical gremlins in my boat. In the process I have replaced blown blade fuses. I have quite the collection over the years of different amp ATO and ATC fuses. I would change out with any of the two provided they were of the same amperage rating. My bad. Thanks to google I found that ATO=open and ATC = closed. Grab one of each and look on the blade side you will see the fuse link = open, (ATO) or the fuse link covered in plastic= closed, (ATC) ATO being open = bad for marine use. (open spark)
Please correct me if wrong.

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Old 02-13-2011, 01:25 PM   #2
fishkisser
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Cool Re: ATC VS ATO Fuses

No correction needed ...
More people should be aware of this especially inboard boaters ...
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Old 02-13-2011, 06:31 PM   #3
namu mac
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Default Re: ATC VS ATO Fuses

Bussman Mfg. uses # ATC and Littlefuse uses ATO. In the past the above explanation was true. Now days Bussman fuses are open enough to allow you to use a tester and not remove the fuse from the holder.
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Old 02-14-2011, 05:46 PM   #4
SlyHawk
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Default Re: ATC VS ATO Fuses

I wonder what the USCG position is on fuses.
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