An electronic device receiving electric power from a power supply, the electronic device comprising: a board at least in part immersed in an immersion case comprising a first heat-transfer liquid for cooling of the electronic device ; the electronic device being characterized in one or more electronic components mounted onto the board and cooled by one or more corresponding liquid cooling units in thermal contact therewith, a second heat-transfer fluid being channelized in the one or more liquid cooling units to collect thermal energy generated by the one or more electronic components ; the electronic device further comprises a leak detection arrangement disposed in a bottom portion of the board and configured to determine a presence of the second heat-transfer liquid in a bottom portion of the immersion case , the second heat-transfer liquid having a density that is higher than a density of the first heat-transfer liquid ; and a controller communicably connected to the leak detection arrangement , the controller being configured to receive signals from the leak detection arrangement and, in response to determining that the signals indicate presence of the second heat-transfer liquid in the bottom portion of the immersion case , cause to disconnect the electronic device from the power supply. a board at least in part immersed in an immersion case comprising a first heat-transfer liquid for cooling of the electronic device ; the electronic device being characterized in one or more electronic components mounted onto the board and cooled by one or more corresponding liquid cooling units in thermal contact therewith, a second heat-transfer fluid being channelized in the one or more liquid cooling units to collect thermal energy generated by the one or more electronic components ; the electronic device further comprises a leak detection arrangement disposed in a bottom portion of the board and configured to determine a presence of the second heat-transfer liquid in a bottom portion of the immersion case , the second heat-transfer liquid having a density that is higher than a density of the first heat-transfer liquid ; and a controller communicably connected to the leak detection arrangement , the controller being configured to receive signals from the leak detection arrangement and, in response to determining that the signals indicate presence of the second heat-transfer liquid in the bottom portion of the immersion case , cause to disconnect the electronic device from the power supply. a leak detection arrangement disposed in a bottom portion of the board and configured to determine a presence of the second heat-transfer liquid in a bottom portion of the immersion case , the second heat-transfer liquid having a density that is higher than a density of the first heat-transfer liquid ; and a controller communicably connected to the leak detection arrangement , the controller being configured to receive signals from the leak detection arrangement and, in response to determining that the signals indicate presence of the second heat-transfer liquid in the bottom portion of the immersion case , cause to disconnect the electronic device from the power supply. <EOS>