The lowest setting is 1%, even if you put in less, TThrottle only goes as low as 1%.
Why? Because otherwise programs may not get enough time to run. As most programs are not tested for this, because Windows will always allow programs to run a minimum amount of time.
If a program would be stopped for some time, it may become instable, unpredictable and even crash.
And if at 1% the CPU or GPU still gets too hot ;D, something else is wrong..
And you can always set the automatic shutdown at the maximum temperature, so the system shuts down gracefully, in the event of overheating