single fuse blown
single fuse blown
(OP)
Hi'
in three phase motor circuit, is it required to replace all the three phases fuses' if one phase fuse blown ?
in three phase motor circuit, is it required to replace all the three phases fuses' if one phase fuse blown ?





RE: single fuse blown
Have you determined why one fuse is blown?
Best to you,
Goober Dave
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RE: single fuse blown
If you cut open a good fuse and look at how they are made, you can better appreciate how the near-clear fault current can deform the fuse element and weaken it. Years ago when I started in this industry, we used fuses with replaceable links (now illegal here in the US). My first boss made us replace all 3 links if one blew, and that gave us newbies the opportunity to see the other two "good" fuses. It was an eye opener.
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: single fuse blown
RE: single fuse blown
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: single fuse blown
RE: single fuse blown
Moderate overloads may be the worst. By the time one fuse melts through and clears the other two may be partly melted and badly compromised.
Yes! Replace all three fuses.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: single fuse blown
Keith Cress
kcress - http://www.flaminsystems.com
RE: single fuse blown
Best to you,
Goober Dave
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RE: single fuse blown
You also asked a good question - if it's known that the fuse blew due to a single phase to ground short then you know the other fuses weren't stressed by the fault.
The nature of the equipment can play a role too. We don't change good fuses in our test bench area.