I am building a system of detectors which are referenced to independent floating grounds. The maximum voltage between each stage is 2kVDC. So I need isolated supplies which can operate continuously at this voltage. I found these Mean Well supplies.

RSD-30G-5 VIN: 9-36V VOUT: 5V RSD-30G-12 VIN: 9-36V VOUT: 12V Both are 30W

The data sheet reads:

WITHSTAND VOLTAGE Input-Output: 4KVDC Input-Frame Ground:2.5KVDC Output-Frame Ground:2.5KVDC

I looked further but I cannot be totally sure the supply wont get shorted in a continuous 2kVDC use. I wanted to know if anyone had a different recommendation regarding the power supply or any thought on using these power supplies at 2kVDC.

I contacted the supplier to clear the rated voltage for continuous operation.


simulate this circuit – Schematic created using CircuitLab

The maximum voltage a detector can go is 2kVDC.

In this link you can find the datasheet and the report of the tests conducted on the device.

  • \$\begingroup\$ What is the accumulated maximum voltage due to the array of independent floating grounds i.e. do the ground potentials stack up thus for some power supplies you might need 6 kV? Draw a picture. \$\endgroup\$
    – Andy aka
    Jun 26, 2019 at 13:00
  • \$\begingroup\$ Suggest posting a system diagram. Are they independent sensors? Or in cascaded stages? How are they connected. Also suggest including a link to the datasheet for the device you've mentioned. \$\endgroup\$
    – scorpdaddy
    Jun 26, 2019 at 13:01
  • \$\begingroup\$ Thanks for your comments I will edit the question. \$\endgroup\$
    – xikhari
    Jun 26, 2019 at 13:11
  • \$\begingroup\$ You can use Mathjax to better format your posts. \$\endgroup\$ Jun 26, 2019 at 13:32

1 Answer 1


Yes if the DC-DC regulator parts meet the DC HIPOT 2.5kV to earth ground spec (?) the floating cascaded low voltage regulators will work at 2kV output.

  • \$\begingroup\$ HiPOT tests are not always designed to show long term sustainability at that voltage... \$\endgroup\$
    – MadHatter
    Jun 26, 2019 at 22:46
  • \$\begingroup\$ @MadHatter true but the difference between short term and long can be as little as 10 or 20% and there is 25% margin. It’s usually the Y. Cap leakage temp rise and frequency of lightning strokes among other component quality factors \$\endgroup\$ Jun 26, 2019 at 22:57

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