From: billp@col.hp.com (Bill Pherigo)
Date: Thu, 28 Mar 1991 19:27:23 GMT
Subject: Re: Big transformers and circuit breakers
Message-ID: <38610007@col.hp.com>
Organization: HP Colorado Springs Division
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!hp-col!col!billp
Newsgroups: sci.electronics
References: <1991Mar23.024309.12334@spool.cs.wisc.edu>

     Are you sure that the power surge isn't because you're trying to
charge up a large cap on the (rectified) secondary of the transformer.
If so, you can use a slow-blow fuse.  I tested many of them and found
some that can handle 15 times their rated current for 1 Sec.  At this
current, the 1 inch size fuses often had over 20 volts ACROSS THEMSELVES
due to IR drop.  The 20mm type fuses were much more "ideal", having only
2.5 volts across themselves.

Bill Pherigo
<billp@col.hp.com>
(719) 590-3420