This is about 400A continuous and I can leave the key in the switch both in the on or off positions. Used to throw it in the glovebox while on the blacktop and fit only when airing down.
Dont bother anymore, just leave it in the switch but in the off position. Good insurance in a front on bingle that my leads are disconnected and cannot be cut or shorted.
Handy as it also saved my leads from being lengthened as the stock supplied leades from my warn didnt reach the rear of the engine bay. Now my short leads from the isolator reach the battery and the stock warn leads do from isolator to winch.
Matt.