The combined power supply NK-11 is a modular modular system of the company ČMŽO-elektronika s.r.o. The charger is designed for powering directly from the 48V vehicle battery network and is intended as a full-fledged replacement for the original NK-1 chargers powered from the 115V/400Hz network. The power supply can also optionally integrate up to 2 24V/300W sources for powering other appliances. For example, the brake control unit and the train radio.