Does anyone know of any devices that can switch 3kV to 10kV at very low currents (500uA-ish) that isn't the size of a single family dwelling with a doghouse in the back? I am trying to put it inside of a reasonably sized enclosure and the only switches I seem to find are Heavy Duty Electrical panel types (way too large).

My thoughts are to use something SPDT with the pole is the output, Throw 1 would be like 3000VDC, Throw 2 would be -3000VDC and select between the two. Anyone know of any good options?

Thanks!

EDIT:
Switching it while the high voltages are present is not going to occur. The goal is simply to get both polarity options to a single SHV connector without disconnecting the cable.

 

I have HV load boxes that are to test 40kv power supplies. I can program them for 1mA load that switches on and off some rate. Inside the switch is a tube. I don't know the part number from memory. There is one option.

4500V MOSFET I have and use MOSAFETs up to 4500V. I have stacked 2 or 3 transistors to get higher voltage.
The IGBTs I have at 4kv and 4.5kv are 200A and larger.
Sanyo and OnSemi make 1500 and 1700V transistors but the current is low.
I have some 5kv reed relays and can fine 30 different types for 10kv.

 

SPDT with the pole is the output,

The only SPDT reed relay I can find for 7500V is obsolete.

 

Will need a DPDT switch to reverse the polarity or a Relay like this when available.

 

Will need a DPDT

Wow a $1000 relay and 18 weeks. I found that relay used on ebay.com for $250. ebay
I was complaining about using two $60 relays to make one SPDT.

 

Wow a $1000 relay and 18 weeks. I found that relay used on ebay.com for $250. ebay
I was complaining about using two $60 relays to make one SPDT.

But it's certainly smaller then a house!

 

Wow I didn't know they made MOSFETs that go up that high in voltage! Looks like some switching scheme using individual reed relay switches may be best for my application. Thanks!

 

digikey Here is a list of 117, 7kv to 10kv low current relays to look at. Many are not in stock.
mouser Similar list.