turning relay on with small voltage change

[Blisk]

I have this modul for ardurino and I like to use it to protect my power supply against short circuit.
Problem is because difference is only 185mV on 1 A.
So how to turn rele on with this module with that low voltage difference?
If someone have better idea how to turn off power supply when short circuit, please let me know I am looking something small and simple and don't like to use fuses.

https://www.ebay.com/itm/1pcs-5A-ra...424345?hash=item58cbafe519:g:k0UAAOSwr81UN9UJ
thank you

 

[kam1787]

Sorry but I have no idea what you are talking about. You seem to have confused at least two different things within one 'question'

 

[BradtheRad]

difference is only 185mV on 1 A.
So how to turn rele on with this module with that low voltage difference?

Do you mean that 185 mV makes the difference whether a relay is On or Off? You need to amplify it so that it becomes several volts. Then it can energize the relay reliably and predictably.

Once the relay is energized it cuts the power. You must design your circuit to keep the relay open. If it closes then the short circuit condition occurs again, turning the relay off again, creating a never-ending repeat.