I don't think it will work on AC lines, but DC should be no problem - giving the magnetic field is strong enough.
Did you search the industrial suppliers for an overcurrent relay?Paul
Why don't you simply use a magnetic sensor (non-mechanical) to mesure gauss. Or a small coil + bridge + comparator ?
Hi friends. is it possible to detect the over current with reed switch ? for example when the AC line current higher than 400 AMP then the reed switch active. thanks.
20 kV, 400A?Please stop messing around with home brew solutions before you kill someone! (could be yourself, but that's your own problem if that happens).That's also not the kind of project where "small", as in mm-sized reed switch, makes much sense. It's also the kind of project where if you have to ask strangers on the Internet for help you're positively NOT qualified to even get near it.
If you had such a device, what is your plan to TEST it?Paul
Assuming this works in principal, and you have a safe way to mount it, how will you calibrate it?- how will you know that the switch triggered at 400A not 40?I'm picturing you in the lab with 400A in a wire, and bringing the sensor closer from across the room until it triggers. Then that will be the "400A distance" and you'll have to design a bracket to keep the switch at that distance, up in the air on the pylon.
installing this device on the line for test