search for a circuit about battery pack over current protection

Dear power designer, expert ,and all interesting, I'm looking for a circuit about battery pack over current protection.This is a battery pack system,and it supply other electronical application power in consumable arean.It need a over current protection circuit to solve the safety problem.I have used National Semicondutor LM358,International Rectifier IR215,and Linear Technology LT6201,but not ideal.The simply specification:when 30V/20A cut-off the supply power loop,and when removed the load or the load current less than the maximum configuration current(for example: 20A) can automatic reset,in the other words now it can automatic start up supply power immediately. Others need low power consuming ,performance less than 1 mA or X uA. If you have any good ideal or experience be good at it to solve the problem,please email to me.My email is snipped-for-privacy@gmail.com. Thanks a lot! Best Regards! Orientsu Song