A device for reducing the consumption of closed-circuit current of a motor vehicle includes a first line, by way of which an ignition switch and a first terminal can be coupled; a second line, by way of which a supply voltage device and a second terminal can be coupled; a switching controller, which is disposed in a signal path of the second line; an actuatable bypassing device, which is switched in parallel to the switching controller and bypasses the switching controller as a function of a first control signal; and a control device, which generates the first control signal for actuating the bypassing device as a function of a first voltage, which corresponds to a difference in potential between a potential at the first terminal and a ground potential, and/or a current value of the current flowing on the second line, and/or a time allowance signal.