I am working with current transformer and I need a circuit that can detect which current transformer is connected to a KRE2 connector / terminal (with 2 terminals). I want to know if it is possible to use a comparator amplifier and with a voltage resistive mesh that I am not sure to size right when I have a current transformer that has output voltage such as (100A: 1V) because it already has a resistor burden mounted inside it or I have a CT with current output as (100A: 5A), at the KRE input have that resistive mesh that goes in the op amp comparator and try to make voltage appear on the op amp terminals so that when it is a TC the comparator will deliver a "0" signal (perhaps because of the potential difference being small between the inverting and non-inverting input. Would the resistor pass the voltage source signal forward?) In this way the two inputs would have the same source of tension. Even when it is the current source, different resistors will drive different voltages. It is possible to make an unbalanced network at the comparator input and then at the input of this unbalanced network put 2 KREs. It has an easier way to use a connector for each CT or weld burden on the CT with current output, but it is not feasible for the cost and logistics here inside the company