Advice THCAD

Mesa has THCAD -5, -10, and -300.

As I understand, if have manual simple plasma generator (there is no dividers in it), I must use THCAD-300 and connect to this device directly to high voltage?
What maximum voltage it supprots? Will it not be dameged with high voltage picks?

What does mean this sentence from datasheet of THCAD:
"The 300V version of the THCAD has all input divider resistor on board and can connect directly to the plasma voltage of touch start type torches only"

What does "touch start type torch"? I'm very new to plasma.

It means the THCAD-300 is not suitable for high frequency start torches
(at least without tapping into the plasma voltage _before_ the HF start transformer)

The voltage at the torch can be as high as 20-30KV when starting with HF
start plasma

Here's a nice photo of the result of connecting a THCAD-300 directly to the torch terminals
of a HF start torch:

forum.linuxcnc.org/forum/search?query=TH...&start=435#gallery-3

Wow, so many answers, thanks you a lot.

So, when plasma starts, in parallel to main power connects high voltage transformer. I need to open plasma, found there rectifier (Plasma has IGBT transistor) and to connect to it?
Or, If I connect THCAD after start of the torch, with help with contactor, it will work fine?

Or, If I connect THCAD after start of the torch, with help with contactor, it will work fine?

assuming you have a contactor rated for 25-30 KV, yes

LOL, it's very funy decision with contactor.)))

For current stage, It's defined, that thcad suits me complitly and I must to install it inside the plasma box.

Thanks for your answers.
When I will start connection of all boards, I will return to this topic and ask where to connect my board.

Who knows, mesa is make shipments now? What situation with quarantine now in that places?