A device is provided for protecting an electronic printed circuit board, which includes at least two layers. The device includes on a layer, at least one conductive part uniformly spread on an insulator layer, the entirety comprising the conductive part and the insulator layer forming a capacitive support presenting a uniform electrical field. The capacitive support is placed roughly on the whole surface of one of the layers of the multi-layered electronic printed circuit board. The capacitive support is configured to deliver a reference capacitance. A capacitive measurement microprocessor detects a variation in capacitance. A transmitter is configured for transmitting a piece of information representing the variation in capacitance when an absolute value of a difference between the measured capacitance and the reference capacitance exceeds a predetermined threshold.