Has anyone used them,in their cars?instead of fuses.As i'm thinking of putting them in my car.I know harleys use them so why not in a car ?

Some circuit breakers cannot handle the vibration (because they are spring loaded). See what has been previously used or recommended for car/truck/motorbike

it depends on the type of circuit breaker

in a large majority of rigid buses run a blade type circuit breaker fuse that plugs into a standard fuse box which i have found no fault with which i will be running in my car when i can locate a good supplier of them

I have them in mine. I had a 60amp off the battery in boot but found it would trip to easily when the motor cranked over for about more than 4 turns when starting or flooded. It was a pain to open boot and reset all time. Currently have a 120amp jobbey and it works a treat.......but i think 120 is little too big. if you could find somethinf inbetween it would be better.

Dont the current crop of WRC cars use circuit breakers instead of switches??!!! Every gram helps......