What marked the shift toward user-serviceable and standardized safety components in automotive electrical systems?

Answer

The development of the blade fuse

The automotive blade fuse represented a move towards components designed for mass production that could be plugged directly into a fuse block, requiring no tools or specialized knowledge for replacement.

What marked the shift toward user-serviceable and standardized safety components in automotive electrical systems?
inventionSafetyelectricitycreatorfuse