The apparatus has control electronics (116) to compare supply voltage present on an alternating current network with a preset threshold and to automatically control displacement of a first switch (97) of an over-voltage protection device (42) toward its open position when the supply voltage exceeds the threshold. A second switch (99) of the device is moved toward its open position in response to the displacement of the first switch to its open position. The first and second switches electrically isolate a lamp and the electronics from the network in the open positions, respectively. An independent claim is also included for a method for operating a public lighting apparatus equipped with an over-voltage protection device.
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