Presumably you are really only interested in three things: -

1. Being able to sustain around 1kV while the contacts are open.
2. Being able to handle high current on contact closure.
3. Low contact resistance when closed.
4. Are not worried about a voltage spec on contacts opening (is the recharg=
e voltage turned on separately?)?

Its ages ago (like back when I was an apprentice) but an RT unit I used to =
deal with used a relay with contacts about 3/16" diameter (they were lightl=
y domed) to handle large currents for operating a 75W transmitter off 12V o=
r 24V. I remember the contacts as being silver plated brass (don't recall c=
oming across tungsten contacts), and I suspect you are after something simi=
lar. I cannot recall if they would open far enough to take 1kV in air, but =
removal of the back contact would allow them to open wider. These were a la=
rge (about 2" x 3" footprint open frame relay without a cover, and I would =
have thought something similar would suit your purpose. I'm afraid I don't =
have any info on manufacturer or model, but at the time I always thought th=
ey would be ideal relays to use for switching driving lights on a car ...=20



> Is there yet a device that will substitute for real relay contacts in an =
AC circuit?
>
> I have a test fixture in mind, which is complicated, but the interesting =
part is discharging a low
> impedance capacitor of about 0.1uF at 1kV into a coil, and allowing the c=
urrent to ring down.
> Spice tells me to expect currents in the kA range, and a prototype built =
with a relay contact seems
> to confirm this.  Tungsten contacts take a lot of abuse, and they also ge=
nerate a lot of heat.
>
> Minimal voltage drop, ability to trigger "closure" and "opening" at any p=
oint in time, huge currents,
> and bidirectional currents without turning off are all requirements.

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.