Protection device and hedging methods for a vehicle-vehicle power and thus equipped vehicle-vehicle power

The invention relates to a protection apparatus (1) for a vehicle electrical system. Securing device (1) comprises a semiconductor switch (4) which is in electrical communication with a voltage source (2) of the vehicle electrical system and to a load (3) of the vehicle electrical system arranged. In addition, a measuring device (8) is provided which is adapted to a voltage drop (U The measuring device (8) is supplied by a constant current supply means (18). In addition, a comparator (13) is provided which is adapted in dependence on the detected by the measuring means (8) the voltage drop (U The invention further relates to a method for overcurrent protection and / or Kurschlussabsicherung and appropriately equipped vehicle electrical system.