How to read current from a non invasive split core transformer AC current sensors
From what I've seen from oscilloscope probes (i.e. much more expensive and hopefully accurate and sensitive than the unit you are referring to), these are sensitive to a tens of mA but I wouldn't really trust them below 10 or 20mA, even for units that max out at lower currents let alone 100A. There are, however, very low current level ones that are 1-5A but I've never used those.

You can place them beside each other if you need more than one.

But they are sensitive to surrounding magnetic fields which can create things like offsets. Once at work I thought I had a leakage current and I couldn't figure out where it was coming from. It turns out just having a nearby transformer powered produced enough of a magnetic field to influence the current sensor.

Why doesn't it have a voltage rating? Well, it doesn't have a datasheet provided either so does that really surprise you information is missing? No datasheet no buy. Another reason...it doesn't connect directly to the line nor does it take a power supply so what type of voltage rating are you expecting?