[Amps] HV fuses

Fuqua, Bill L wlfuqu00 at uky.edu
Fri Oct 25 01:38:56 EDT 2013


   This does not sound right. I assume you are saying that they are glass fuses.
I suspect if you blow one in a HV powe rsupply it will shatter or explode into pieces if
you have a reasonable value of filter capacitor.  Do you have a data sheet on these
fuses? 
73
Bill wa4lav

________________________________________
From: Amps [amps-bounces at contesting.com] on behalf of Jim Garland [4cx250b at miamioh.edu]
Sent: Thursday, October 24, 2013 7:58 PM
To: Amps at contesting.com
Subject: [Amps] HV fuses

Out of curiousity, I bought several 900 mA/5 KV fuses from an eBay Chinese
supplier. They arrived today. They fit fine into 3AG fuse clips, but are
about 50% longer. Internally they have a spring connected to the fuse link
which pulls the connection apart when the fuse opens. If they work, they're
pretty cool. and VERY inexpenisve.  I'm wondering why one couldn't parallel
two or three of them to multiply the current rating?  Assuming they're
reasonably well matched, so that the current divides equally among the
fuses, it would be a very compact and inexpensive HV protection circuit. I
would mount fuse clips on a piece of G10 circuit board and mount the
assembly on ceramic standoffs. When one fuse opened up, all would open up,
but replacing three fuses would cost  only a dollar or so. I'll test some of
the fuses ( I bought twenty) to see how accurate their current rating is.  I
have no convenient way to test their HV rating, but I'd use them only at
2500V in my dhomebrew amplifier.

73,

Jim W8ZR

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