Greg:
The info and links provided by libellis answers the questions.
The 'cut out' on the primary tap is fused, and most here 'drop out' if/when the primary fuse faults.
A majority of pots here have built in secondary OCP, which can be reset via an external handle on the side of the pot. I've come across a few linemen/shooters who do the reset via a long hot stick from grade when bucket access is limited.
The above links are very informative.
