The CT (Current Transformer) you have chosen is a pretty standard CT. A single current carrying conductor is passed through the center hole and acts as the primary. The transformer has a 1000:1 ratio Input to Output. Therefore with a full scale input of 30 Amps the output current will be 30 mA into a burden load of 100 Ohms. See the charts on the data sheet, they cover that. If you start increasing the burden resistance the CT like any CT becomes inaccurate.
Therefore with a 30 Amp primary current the secondary current is 30 mA through 100 Ohms so you get a 3 volt drop across the 100 Ohm resistor. Now your 0 to 30 Amps is equal to 0 to 3 Volts. The frequency will be whatever the primary frequency is. If a primary current os 2 Amps is passed the output will be 2 mA through the 100 Ohm burden resistor resulting in a 200 mV drop. You now have 200 mV RMS to work with.
Unfortunately that 200 mV now needs to be amplified before you can convert it to DC. Once amplified that voltage is converted to a DC level and sent on to a comparator circuit and compared to a reference voltage.
Something to consider is that your CT is based on primary amp turns. Passing the conductor through the hole is one amp turn. That same conductor can be looped through the hole several times to increase the output. Each loop doubles the output. So if 2 amps primary with a single turn yields 200 mV then 4 amp turns would yield 800 mV which becomes easier to amplify and helps eliminate noise.
Additionally the same line of CT you plan to use also comes in
this 5 amp model so why bother with a 30 amp CT when you goal is to measure a 2 amp trip unless your main conductor will well exceed 5 amps. Matter of fact they make a 5, 10, 15, 20 and 25 amp model of the same CT.
Ron