Arrangement for electrically safeguarding a first operating state in a power grid with a system-induced source internal resistance, which varies in an ageing-induced and temperature-induced manner, of a high-voltage traction battery for an electrically driveable means of transportation, comprising: - a first protective device in the form of a fuse, the response behaviour of which is sufficient to safeguard the power grid against a predefined load in a second operating state, but not in the first operating state, wherein the traction battery has a higher source internal resistance in the first operating state than in the second operating state, and - a second protective device (7a, 7b, 7c, 8a, 8b) that is designed to safeguard the power grid against the load that occurs below the response behaviour of the first protective device in the first operating state, wherein the second protective device (7a, 7b, 7c, 8a, 8b) - comprises an undervoltage cut-off comprising a voltage measuring device (7b, 7c) for the traction battery, characterized in that the second protective device (7a, 7b, 7c, 8a, 8b) is designed, in the case of a response, to open an isolating element in the form of a contactor (8a, 8b) so as to isolate the traction battery from the power grid, wherein the second protective device (7a, 7b, 7c, 8a, 8b) also - comprises an overcurrent cut-off comprising a current measuring device (7a, 7c), and wherein a current threshold value for the overcurrent cut-off and a voltage threshold value for the undervoltage cut-off, over a current (I batt) through the high-voltage traction battery and the source internal resistance of the high-voltage traction battery, are defined such that the response ranges (II, III) of the overcurrent cut-off and the undervoltage cut-off, over the current (I batt) through the high-voltage traction battery, at least adjoin one another, in particular overlap one another, wherein the traction battery has series-connected cells and the total number of series-connected cells of the traction battery, multiplied by a minimum cell individual voltage in the case of a response of the undervoltage cut-off, divided by a lower current threshold value in the case of a response of the overcurrent cut-off, is greater than a maximum short-circuit resistance which can be assumed for a potential short-circuit path, wherein a second line section has a smaller line cross section than a first line section of the potential short-circuit path, and wherein the strength limit of the first protective device is inadequate for safeguarding the second line section in the first operating state of the traction battery. - a first protective device in the form of a fuse, the response behaviour of which is sufficient to safeguard the power grid against a predefined load in a second operating state, but not in the first operating state, wherein the traction battery has a higher source internal resistance in the first operating state than in the second operating state, and - a second protective device (7a, 7b, 7c, 8a, 8b) that is designed to safeguard the power grid against the load that occurs below the response behaviour of the first protective device in the first operating state, wherein the second protective device (7a, 7b, 7c, 8a, 8b) - comprises an undervoltage cut-off comprising a voltage measuring device (7b, 7c) for the traction battery, characterized in that the second protective device (7a, 7b, 7c, 8a, 8b) is designed, in the case of a response, to open an isolating element in the form of a contactor (8a, 8b) so as to isolate the traction battery from the power grid, wherein the second protective device (7a, 7b, 7c, 8a, 8b) also - comprises an overcurrent cut-off comprising a current measuring device (7a, 7c), and wherein a current threshold value for the overcurrent cut-off and a voltage threshold value for the undervoltage cut-off, over a current (I batt) through the high-voltage traction battery and the source internal resistance of the high-voltage traction battery, are defined such that the response ranges (II, III) of the overcurrent cut-off and the undervoltage cut-off, over the current (I batt) through the high-voltage traction battery, at least adjoin one another, in particular overlap one another, wherein the traction battery has series-connected cells and the total number of series-connected cells of the traction battery, multiplied by a minimum cell individual voltage in the case of a response of the undervoltage cut-off, divided by a lower current threshold value in the case of a response of the overcurrent cut-off, is greater than a maximum short-circuit resistance which can be assumed for a potential short-circuit path, wherein a second line section has a smaller line cross section than a first line section of the potential short-circuit path, and wherein the strength limit of the first protective device is inadequate for safeguarding the second line section in the first operating state of the traction battery.