I have a regulated DC Adapter with the following specs:

input: 12V DC (from cigarette lighter socket)
output select: (3, 4.5, 6, 7.5, 9, 12)V DC, 0-300mA

Is a "1A, 125V" fuse safe enough to use (for the sake of protecting the car
battery and the electronics connected to the adapter)? What is a "typical"
fuse in such an environment for use with portable electronic gadgets? Any
hard data for typical ranges for current and voltage spikes during car
ignition?

Thanks
Al-U