On Thu, 24 Dec 2009 14:43:30 +0000, Ian Bell wrote:

I am trying to select a relay for a delayed HT switch (which will also
discharge the HT when off). Most relays I can find have contacts rated
at 250VAC which translates into a peak of about 350V. However, data is
scarce on what dc voltage these relays can switch. So far I have found
only one that gives a dc current versus voltage curve and that stops at
210V dc (and 200mA) and I really want to be able to switch up to 350V at
up to 200mA. The rest just give a dc voltage at max current value.

So, I am guessing that this problem has been faced before and there are
relays that are known to work fine in this application. Any
recommendations?




Did you get this sorted out Ian? The thread in rat seems to have
degenerated into the usual slanging match with Phil. :-(

By the way, you may not find it too easy getting hold of a suitable relay
with a 5v coil. Manufacturers often list them down to 6v but nobody
stocks them! The nearest that you will get easily will be 12vdc and the
next one up is 24vdc. 5v coils are usually only on small pcb relays,
which don't have enough voltage rating on the contacts, even in series
(if you can ever find a complete data sheet!).

--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info
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