Apparatus (1) for damping of voltage and current peaks in a telecommunications network/system, comprising an input data connector (2a) and an output data connector (2b) arranged serially on a voice and/or data electric line, and a damper (3) having a casing (8) comprising a mixture of particles of a piezoelectric material and a refractory inert material, configured to transform the energy load of electromagnetic stress which causes overvoltages and overcurrents into mechanical energy and into thermal energy, into which mixture a plurality of input electrodes (5), that are connected to respective cables (6a) of the input data connector (2a) and to respective cables (6b) of the output data connector (2b), and an earth-connected conductive heat dissipation bar (7) are partially immersed.