I need to protect my device from the flowing through currents above let's say 30 Amps.
So I need a black box which will generate a digital signal if the current will be greater than specified (e.g. +/- 30 Amps). Rest things (circuit breaking) will be done elsewhere.
First I think about hall-effect sensor with comparator. Except that this is a branchy scheme with a separate isolated power supply this approach is slow (typically about 5 us).
Isn't there any off the shelf solutions for protection?
SOME MORE DETAILS
I need to protect my own device primarily (load protection is also welcome). Mainly from a short circuit. My estimation is that I need to break the circuit within about 1,5 us: if I wrong with this estimation please let me know your consideration.
ABOUT THE LOAD
The load most likely will be LED drivers. So it will not likely to be inductive. Probably capacitive in some degree. Nominal voltage is 230 VAC, nominal current estimated to 20 Amps.
If asking about how I'm going to break the circuit that fast - the answer is that I have MOSFETs in series so I can switch them all off pretty fast: