601 amp fuse

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That was funny indeed.

I think it's because someone might want the protection of a 600a fuse that fits a larger-class fuse-holder.
 
I say we test it before we install it , just to make sure it dosn't blow at 600 amp but does blow at 602 amp. you wouldn't want to get taken advantage of due to false labeling.
 
laughing from reading the responses. A 601 fuse is designed to fit a Class L Switch/Disconnect, with a bolt-in pattern. These are usually installed in the "Mains". Every-once-in-awhile, I get a call out for a 401, 501, 601 amp fuse. As per UL 248, fuses are designed to hold 110% of their rating continously. Some fuses are also rated to carry 500% for 10-20 seconds to ignore the motor inrush, however clear within 1/2 cycle (.008 seconds).

just my $.02
 
Several years ago we used 601 in a chiller replacement, customer had 800 amp bolted pressure switches and did not want to replace them, the 601 met the criteria of the OCP needed.
 
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joseph j 1977 said:
where would and why would anybody need this type of fuse????
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If you are pulling this from some European or Oriental literature, I'd ask if that might be a designation issue ... 600 = 6.0x10^0; 601 =6.0x10^1, etc. I have seen that on overloads and electronic components mostly.
 
Perhaps this question should be referred to someone like Buss Fuse company. They should know.
My Code book is buried but I have a hunch there is some sort of dividing line between up to >600 amp circuits and anything above 600 amps. So a 601 amp fuse would fit some sort of requirements while providing protection of around ~600 amps.

Do they make a miniscule difference in this fuse or just give it a different label?
~Peter
 
peter said:
Do they make a miniscule difference in this fuse or just give it a different label?
~Peter
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There is a huge difference.

About 2" in height.

A 600 amp fuse pushes in.

A 601 amp fuse bolts in.

It is all about putting a '600 amp' fuse in a higher rated fuse holder.
 
iwire said:
There is a huge difference.

About 2" in height.

A 600 amp fuse pushes in.

A 601 amp fuse bolts in.

It is all about putting a '600 amp' fuse in a higher rated fuse holder.
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I agree with Bob on this. The difference is the "frame" size of the fuse, not really the amperage rating. It is a 600 amp fuse that will fit into NEMA rated 800amp size equipment
 
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