I have opened up the one john sold me and you are corect, no circuit breaker. Do all other after market remotes discussed here have a circuit breaker? Can one be installed or is it necessary? I have not had any trouble with the one I have. I does get warm, but not hot. He also uses 12/4 wire which is really heavy guage wire.
((edit:10/4 wire)) the wires are wired directly to the outlet on the machine that has its own circuit breaker for tools, and the other two wires from the rheostat go through the fuse beneath the rheostat. so maybe thats how it's taken care of.
rs