Uninterruptible power supply

An uninterruptible power supply for an electrical consumer, comprising:

• a first current path;
• a second current path, wherein the first current path and the second current path are configured to supply electrical energy;
• a first switch configured to interrupt the first current path;
• a first voltage transformer configured to limit a current intensity of an electrical current, wherein the first voltage transformer is in the second current path;
• a controller configured to open the first switch when a current intensity limit value of the electrical current in the first current path is reached to electrically interrupt the first current path and conduct the electrical current over the first voltage transformer to limit the electrical current;
• and
• at least one energy source configured to supply the electrical energy, wherein the first current path and the second current path are connected to the at least one energy source, and wherein the at least one energy source is an energy storage that comprises:
• a third current path and a fourth current path that are switched in parallel to one another and are configured to connect the first current path and the second current path with the energy storage, wherein the third current path and the fourth current path are electrically connected with the first current path and the second current path, wherein the energy storage is electrically connected to the third current path and the fourth current path,
• a second voltage transformer configured to limit the current intensity of the electrical current, wherein the second voltage transformer is in the fourth current path, and
• a second switch configured to close or open the third current path, wherein the controller is configured to close the second switch to connect the electrical consumer with the energy storage.