Device for supplying power for a control unit for a vehicle, wherein the device has the following features: a first terminal for a first power supply path, a second terminal for a second power supply path, and a neutral point for connecting the first power supply path and the second power supply path, wherein the neutral point represents a ground terminal for an electric circuit of the control unit; the first power supply path and the second power supply path, wherein the two power supply paths represent independent and redundant ground power supply paths; a first switch having a first contact and a second contact, wherein the first contact is connected to the first terminal and the second contact is connected to the neutral point, wherein the first switch enables current to flow between the contacts of the first switch in a closed state and prevents it in an open state, and a second switch with a first contact and a second contact, wherein the first contact is connected to the second terminal and the second contact is connected to the neutral point, wherein the second switch enables current to flow between the contacts of the second switch in a closed state and prevents it in an open state; a first measuring contact for detecting a first measured value representing a voltage potential of the first power supply path, and a second measuring contact for detecting a second measured value representing a voltage potential of the second power supply path; a third terminal for providing a voltage potential, a first spur line comprising at least a first resistor (254; 485) and a first diode, which connects the third terminal to the first terminal, and a second spur line comprising at least a second resistor (256; 486) and a second diode, which connects the third terminal to the second terminal, wherein the first measuring contact is arranged on the first spur line and the second measuring contact is arranged on the second spur line; a control device which is configured to keep one of the switches (116, 118) open and the other of the switches (116, 118) closed in response to a test state of the device and to keep the first switch and the second switch closed during a fully functional normal operation; and a monitoring device which is configured to provide a monitoring signal using the first measured value and the second measured value when the device is in the test state. a first terminal for a first power supply path, a second terminal for a second power supply path, and a neutral point for connecting the first power supply path and the second power supply path, wherein the neutral point represents a ground terminal for an electric circuit of the control unit; the first power supply path and the second power supply path, wherein the two power supply paths represent independent and redundant ground power supply paths; a first switch having a first contact and a second contact, wherein the first contact is connected to the first terminal and the second contact is connected to the neutral point, wherein the first switch enables current to flow between the contacts of the first switch in a closed state and prevents it in an open state, and a second switch with a first contact and a second contact, wherein the first contact is connected to the second terminal and the second contact is connected to the neutral point, wherein the second switch enables current to flow between the contacts of the second switch in a closed state and prevents it in an open state; a first measuring contact for detecting a first measured value representing a voltage potential of the first power supply path, and a second measuring contact for detecting a second measured value representing a voltage potential of the second power supply path; a third terminal for providing a voltage potential, a first spur line comprising at least a first resistor (254; 485) and a first diode, which connects the third terminal to the first terminal, and a second spur line comprising at least a second resistor (256; 486) and a second diode, which connects the third terminal to the second terminal, wherein the first measuring contact is arranged on the first spur line and the second measuring contact is arranged on the second spur line; a control device which is configured to keep one of the switches (116, 118) open and the other of the switches (116, 118) closed in response to a test state of the device and to keep the first switch and the second switch closed during a fully functional normal operation; and a monitoring device which is configured to provide a monitoring signal using the first measured value and the second measured value when the device is in the test state.