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From: "Keith Buck"
References: <firstname.lastname@example.org> <3DE64488.D6CE9A83@mfi.net> <email@example.com>
Subject: Re: High DC current Transfer Switch
Date: Sun, 1 Dec 2002 21:59:30 -0000
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
NNTP-Posting-Date: Sun, 01 Dec 2002 21:54:48 +0000
I missed the original post but switches for this duty are readily available
for electroforming plant. In europe Soule or Le Carbone (Ferraz) make them.
There are various types. I have used them at 100kA continuous at 120V DC and
this type would typically cost about $50k t0 250k depending on how many
poles and ways required. They are usually designed for welded Al busbars
(Typically 14"" x 1" x up to 30 bars). They cannot be used as on-load
switches. For on-load duty Mechanical types can be used at up to 750v DC and
10kA continous duty, but are getting hard to get as most are used for
railway duty. UK manufacturer Whip and Bourne make them. Solid state
Thyristor types (Water cooled) are simple to ma and can easily do this duty.
GTOs look as though they may fit your requirement but are expensive.
Regards Keith buck
"Tony Williams" wrote in message
> In article <3DE64488.D6CE9A83@mfi.net>,
> Michael A. Terrell wrote:
> > Just be glad its not in the next room while you're working. It could
> > shake things off your bench. :)
> That head-twitch isn't a nervous tick, it's
> the fillings in his teeth, snapping sideways
> every time the contactor operates.
> Tony Williams.
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