Abstract: Switch mode power supply system, characterized in that it comprises at least one power supply module (10) supplying at least two controlled DC output voltages through respective first connection means (22, 24), where the two first connection means (22, 24) are electrically insulated from each other; a connection device (30) comprising a first connection interface (32) with first output terminals (38, 39) for connection to a first load and a second connection interface (62) with second output terminals (68, 69) for connection to a second load, where each connection interface (32, 62) comprises second connection means (34) for connection to the first connection means (22, 24) of the at least one module (10); where the power supply system is supplying power at a first voltage level when connected to the first connection interface (32) and supplying power at a second voltage level when connected to the second connection interface (62).