I'm searching for the HV reed relay solution for channels multiplexing printed board design: V < 6KV, I < 10mA. 8 relays that connect 8 input pins to V or GND (given for an external supply device). Relay Coils control (12V) will be forced from PLC outputs.

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I have 4 relay models preselected and I was analyzing their features. I have no doubt about what I want at electrical features. Some manufacturers offers different types of connection as a mechanical feature; example:


At first I thought in "Solder PCB HV connection" as the perfect and suitable connection for the PCB. But thinking in HV design I remembered one of the rules to prevent arc, corona, HV field, etc, about physically separation between HV circuits and LV circuits. Hence the "Flying Lead HV connection" has come to my mind as a perfect solution too as the output is separated from the board surface. Relays output signals could be brought to the case connector directly through propper wires.


Do you think this is a good idea in order to improve HV related issues? Is it better "Flying Lead HV connection" option for HV separation rather than "Solder PCB HV connection"? Would you choose the first option or the second?

If answer is yes, what considerations must I take about wiring relay outputs directly?


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