I'm not talking about mechanical safety here - that's well understood.
I'm referring to the safety of the electrical system, and protection of its components. Namely:
- insulation
- motor protectors
- battery protection
I'm aware that the primary purpose of the auto-resetting breakers is for the protection of the wire.
EDIT: I'd also like to discuss connectors, keying, and color-coding, but that's safety in the testing and maintenance sense. I will reserve that for another thread.