Voltage presence relay?

g.mccormick · Sep 14, 2022

I am attempting to find a relay type device that would indicate when DC voltage is present. I would like it to act similar to a Grace Technologies voltage indicator, but instead of visual indication I need a contact.
https://shop.graceport.com/products...Ch-9TFnFYhhTPLPhQ8LhoM9UQ1yM-4KYaAnWiEALw_wcB

DC voltage up to 1200VDC.

TWS · Sep 14, 2022

https://www.automationdirect.com/ad...ti-range_dc_current_operated_switches#start=0.

g.mccormick · Sep 14, 2022

That is DC current. I need to check for presence of DC voltage

TWS · Sep 14, 2022

Ten this: https://www.knick-international.com...line/railway-transducers/proline-p-52000-vpd/.

parky · Sep 15, 2022

A relay comes to mind ?, if energised a contact is closed, if not it is open. so no voltage. however, you would need another source for what ever the output does, or is this too simple, unless you need to detect threshhold i.e. below a certain level.

ASF · Sep 15, 2022

parky said:
A relay comes to mind ?, if energised a contact is closed, if not it is open. so no voltage. however, you would need another source for what ever the output does, or is this too simple, unless you need to detect threshhold i.e. below a certain level.

That's what came to mind for me too, until I read the last line of the post...

DC voltage up to 1200VDC.

Not sure I've ever come across a relay with a 1200VDC coil!

parky · Sep 15, 2022

Ooops.. Yeah that's a bit high.

MikeyN · Sep 15, 2022

What about something like this? https://www.knick-international.com/en/products/interface-technology/proline/high-voltage-transducers/proline-p-52000-vpd/

Saffa · Sep 15, 2022

The thing MikeyN linked too certainly has the right specs, but did you see the size of it!?

Also, designed for rail use = $$$$

g.mccormick what is the application / industry where this 1200VDC exists in?

I mean in theory you can just build a simple voltage divider with two resistors, drive an op-amp into saturation and switch a small relay with the output of that, but I don't know that I'd feel comfortable with anything I rolled myself at 1200VDC.

TheWaterboy · Sep 15, 2022

A hall effect switch might work.

Rob... · Sep 16, 2022

https://selcousa.com/product/rh12/

Something like this would do.

plvlce · Sep 16, 2022

Rob... said:
https://selcousa.com/product/rh12/

Something like this would do.

Would it? Its specification is 'From 800VDC up to 1200VDC' so it sounds like it would not detect, say, 700VDC.

OPs requirement of 'up to 1200VDC' certainly sounds like he wants the whole range detected not just part of it.

User22 · Sep 16, 2022

use a high voltage dividers and a comparator circuit.

PreLC · Sep 17, 2022

Did not seem to find any Siemens or Pheonix Contact relays, but I did see an ABB catalog for voltage monitoring which talks about upto 1500VDC:
https://search.abb.com/library/Down...LanguageCode=en&DocumentPartId=&Action=Launch

CM-IWM.11 Seems like it might work for your application.

Voltage presence relay?

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