Yes, it has a thermal cut out in there. Never had any issues with that winch and it should pull a house down. Just worth checking all of the connections on the winch. I used it to pull pretty hard. The winch is rated at about 4 tonnes so don't know why an 8 t block wouldn't be good enough. Remember it's a plasma rope too not a steel one. Make sure that whatever you use to attach it to the tree is rated at the same or more than then block then. No good having a 9t block and a 5 tonne strap! But you know that stuff.
Chris
Chris