The 500W inductive load question got me thinking. Cars have large radiator fans that often draw more than 15A and are pretty inductive. Do automotive relays have any sort of protection from inductive kick back? Also, in a situation where a physical switch does the switching of power does the switch take the grunt of damaging kick back or does the damaging effect propagate to the source as well? The physical act of breaking the circuit does generate a spark when a simple switch is used.