Device for monitoring a power distributor of a motor vehicle

A device for monitoring a power distributor of a motor vehicle, the power distributor being configured to connect and disconnect two on-board electrical subsystems, the device comprising:

• at least one main path, and at least one additional path connected in parallel to the main path, the main path and the additional path being arranged between an on-board electrical subsystem for at least one safety-relevant load and a further on-board electrical subsystem for at least one non-safety-relevant load, the main path includes a switch, and the additional path includes a switch, wherein the power distributor includes at least one evaluation device configured to detect a state that is critical to the on-board electrical subsystem for the safety-critical load, including overcurrent and/or undervoltage or overvoltage at the on-board electrical subsystem for the safety-critical load, and to open the switch of the main path and/or the switch of the additional path, when the critical state is detected;
• and
• at least one monitoring device configured to monitor, independently of the evaluation device, a current flowing via the additional path and to actuate at least the switch of the additional path.