Vehicle electrical system, comprising - a first vehicle electrical system branch with a first nominal voltage U 1, - a second vehicle electrical system branch with a second nominal voltage U 2, - at least one DC/DC converter which is designed to transfer energy between the first vehicle electrical system branch and the second vehicle electrical system branch, - a first actuating unit which is designed to actuate the at least one DC/DC converter, - a first detection unit which is designed to detect an instantaneous voltage U act,1 of the first vehicle electrical system branch, - a first comparison unit which is designed to compare the detected instantaneous voltage U act,1 with a first upper voltage threshold value U o,1 and a first lower voltage threshold value U u,1, where U u,1 < U 1 < U 0,1, - wherein the first actuating unit is designed to actuate the at least one DC/DC converter in such a way that energy is transferred from the first vehicle electrical system branch to the second vehicle electrical system branch if U act,1 > U o,1, and that energy is transferred from the second vehicle electrical system branch to the first vehicle electrical system branch if U act,1 < U u,1, characterized in that - the first comparison unit is also designed to compare the detected instantaneous voltage U act,1 with a second upper voltage threshold value U o,2 and a second lower voltage threshold value U u,2, where U u,1 < U u,2 < U 1 and U 1 < U o,2 < U o,1, and - the first actuating unit is also designed to actuate the at least one DC/DC converter in such a way that the transfer of energy from the first vehicle electrical system branch to the second vehicle electrical system branch is ended if U act,1 < U o,2, and that the transfer of energy from the second vehicle electrical system branch to the first vehicle electrical system branch is ended if U act,1 > U u,2. - a first vehicle electrical system branch with a first nominal voltage U 1, - a second vehicle electrical system branch with a second nominal voltage U 2, - at least one DC/DC converter which is designed to transfer energy between the first vehicle electrical system branch and the second vehicle electrical system branch, - a first actuating unit which is designed to actuate the at least one DC/DC converter, - a first detection unit which is designed to detect an instantaneous voltage U act,1 of the first vehicle electrical system branch, - a first comparison unit which is designed to compare the detected instantaneous voltage U act,1 with a first upper voltage threshold value U o,1 and a first lower voltage threshold value U u,1, where U u,1 < U 1 < U 0,1, - wherein the first actuating unit is designed to actuate the at least one DC/DC converter in such a way that energy is transferred from the first vehicle electrical system branch to the second vehicle electrical system branch if U act,1 > U o,1, and that energy is transferred from the second vehicle electrical system branch to the first vehicle electrical system branch if U act,1 < U u,1, characterized in that - the first comparison unit is also designed to compare the detected instantaneous voltage U act,1 with a second upper voltage threshold value U o,2 and a second lower voltage threshold value U u,2, where U u,1 < U u,2 < U 1 and U 1 < U o,2 < U o,1, and - the first actuating unit is also designed to actuate the at least one DC/DC converter in such a way that the transfer of energy from the first vehicle electrical system branch to the second vehicle electrical system branch is ended if U act,1 < U o,2, and that the transfer of energy from the second vehicle electrical system branch to the first vehicle electrical system branch is ended if U act,1 > U u,2.