24V DC Votage Detector-Relay

[tctctraining]

I am looking for a low consuption 24V voltage detector.
Basically this device shall only detects the voltage presence.
When voltage is detected then a relay actuates, or 24V DC contacts closes. The amp rating for those contacts can be around 0.5 Amp.
The trick is to find a relay( electrical or electronic) with low consumtion power!!!

I appreciate any feed back on this.

 

[ScottyUK]

Solid state relay (SSR) is the easiest solution - current drain on the 'coil' is a few mA, if that. Only potential problem might be that they tend to turn on with anything over about 3V or so, so if you're after a simple on-off signal they will be ok but if you want a 'supply healthy' signal they not be so good.

Check out products by Crydom and Grayhill for starters, there are plenty others. Start with Google!


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If we learn from our mistakes I'm getting a great education!

 

[rjvh]

What do you want to switch?

if it is only a signalling you might use a logic port to detect and use a led indicator or use a opto coupler to transfer the signal to another circuit.

Robert-Jan

 

[CharlieGill]

PhotoMos relays in the AQV family (now made by Panasonic) will operate with 1 ma forward current and can switch 0.5A. You would need to connect a zener in series to set the detection voltage and a current limiting resistor.

If you can be a bit more specific, other options might be better.

Charlie

 

[OperaHouse]

An active zener like the LM431 is simple and would be adjustable to a set voltage. This would guarantee turn off below a certain voltage.

 

[lifeguard1]

try a Wago terminal block style relay. L>ow consuption good relay output modes. The other thing you could try is a pc board mounted style.