When spawning PrimedTnt with a Fuse data tag, the tnt ignores the fuse and explodes instantly. I used this command to spawn it:
/summon PrimedTnt ~ ~ ~ {Fuse:150}
I'm pretty sure that's right because even in the NBT Data it is done the exact same way. Maybe I'm wrong I don't know
Edit: So, I tried putting in a fuse of 100 in and it worked. After some testing, it appears to only work if the value is under 128, which I assume is because that is the max fuse value. tldr: fuse tag works, limited to 127