"Ian Bell" wrote in message
...
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?

By the way I prefer a 5V coil.

Cheers

Ian

Use a Triac. The gate can then be triggered by a low voltage relay like a
reed. I built such a delay into a valve amp I designed many years ago, which
used a SS bridge rectifier, and I wanted to delay the HT until the heaters
had warmed up. Used a Unijunction transistor timer to create a 30 second
delay, then that closed the reed relay which fired the Triac. 1000 volt 1
amp or more Triacs are cheap.

S.