TA12L-100 current sensor max current
The core will tend to saturate so you'll lose accuracy. How much is anyone's guess, but if it really works down to 20Hz/5A it might not be too bad at 60Hz/15A. I have doubts- would not be gobsmacked if it reads 30 or 40% low at 15A. Otherwise they put 2x ~ 3x as much core in there as they needed.