The invention relates to a device for protecting at least one active component of an electronic module, able to receive a microwave electromagnetic signal as input and to provide a microwave electromagnetic signal to said at least one active component. This device includes a delay module able to apply a predetermined delay time to the microwave electromagnetic input signal, connected in parallel with a switch-triggering device able to compare a power level of the microwave electromagnetic input signal to a power threshold and to command switching by a switch connected at the output of the delay module, an output of said switch providing the microwave electromagnetic signal to said at least one active component, the predetermined delay time being such that the switching is done before the arrival of the microwave electromagnetic output signal from the delay module.