High voltage switching

Discussion in 'General Electronics Chat' started by Mathijn Bernards, May 31, 2018.

  1. Mathijn Bernards

    Thread Starter New Member

    May 31, 2018
    3
    0
    I need to make a circuit to switch high voltage between two parts. Say I have one part A and one part B, separated by a large resistor (2 Mohm) and I have a high voltage supply. I want to switch between setting the voltage on part A and grounding part B, or setting the voltage on part B and grounding part A, switching only when not in operation. How should I do this? In a low voltage application I could use a dpdt switch but this likely won't work for high voltages.

    Any help would be greatly appreciated!
     
  2. ericgibbs

    Moderator

    Jan 29, 2010
    8,155
    1,651
    hi MB,
    Welcome to AAC.
    What high voltage are you using..?
    E
     
  3. Mathijn Bernards

    Thread Starter New Member

    May 31, 2018
    3
    0
    Hello!
    Voltage I'm using is up to 4 kV DC at max 0.5 mA current.
     
  4. casteels

    New Member

    Mar 22, 2012
    9
    3
    Did you have a look here: http://www.behlke.com/
    I have used it to switch a high voltage on an electrode.
     
  5. ericgibbs

    Moderator

    Jan 29, 2010
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  6. recklessrog

    Well-Known Member

    May 23, 2013
    980
    379
    If you live in the U.K, I have some high vacuum high voltage reed relays that would do the job. I have used them up 15kV with no problems.

    Also QRO-stuff on E.bay keeps a lot of high voltage equipment, mostly ex USSR military.
     
  7. Mathijn Bernards

    Thread Starter New Member

    May 31, 2018
    3
    0
    Thanks for the replies everyone!
    I think a high voltage relay will do the job and I found several on RS just like the one Eric linked.
    I don't live in the UK but I will take a look at the QRO-stuff as well.
     
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