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If only 1 fuse blows in three phase equipment, would you replace only the blown fuse or all 3?
Only 1 29%  29%  [ 16 ]
All 3 45%  45%  [ 25 ]
It depends 27%  27%  [ 15 ]
We don’t use fuses 0%  0%  [ 0 ]
Total votes : 56
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 Post subject: Replace only blown or ALL fuses
PostPosted: Sun Mar 10, 2019 5:33 pm 
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1736
Location: Scottsdale, Arizona
Here is another fuse question. This one comes up for debate from time to time.

Here it is:

If only 1 fuse blows in three phase equipment, would you replace only the blown fuse or all 3?
Only 1
All 3
It depends
We don’t use fuses


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 Post subject: Re: Replace only blown or ALL fuses
PostPosted: Mon Mar 11, 2019 5:23 pm 
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Joined: Tue Oct 26, 2010 9:08 am
Posts: 2178
Location: North Carolina
If it's feeding a single phase load then it wouldn't make sense to replace all 3.

If there is a reason that I believe that only one or two fuses saw the overcurrent then it makes sense to only replace those. Otherwise, replace all 3.

Gets tricky with for instance semiconductor fuses in drives where you start having to sort of guess what's going on.


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