system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't cars have breakers like buildings?
gpt
Keep it simple.  The fewer moving parts you have the less likely something is to break.  There is a lot of bumping and vibration in a moving vehicle, both from just the engine running and driving over the road or rough terrain.  Household breakers have contacts that are pulled apart in the event of a surge, but sufficient vibration or a sudden shock could force them apart prematurely.  You really don't want random systems in your car getting powered down while driving.