Method for operating a hybrid relay below a predefined low noise level (N L ) comprising a solid state relay part and electromechanical part mounted in parallel, wherein said electromechanical part has a drivable coil , at least a first stationary contact , and at least a movable contact that can be alternatively switched between a closed position (P c ) and an open position (P o ), wherein a control unit is connected to said drivable coil via a digital-to-analog converter for applying in operation a drive signal (S,S',S") to said drivable coil , characterized in that the method comprises: - A first step of determining a first minimum voltage value for said drive signal (S,S',S") above which said movable contact starts to move away from said open position (P o ); - A second step of determining a second minimum voltage value for said drive signal (S,S',S") above which said movable contact reaches said closed position (P c ); - And a subsequent step of shaping a waveform (W) for a modified drive signal (S',S") comprising a first portion (W1) consisting of a substantially vertical segment jumping from zero to said first minimum voltage value yielded in previous said first step; followed by a second portion (W2), wherein the voltage is gradually increased from said first minimum voltage value to said second minimum voltage value yielded in previous said second step within a time period shorter or equal to a noise-free linear closing time (T L ) representative of a closing time achievable by applying either actually or theoretically a linear drive signal (S) having a predefined slope (α) in order to remain below said acceptable low noise level (N L ) constraints set for said hybrid relay , and finally a third portion (W3) consisting of another substantially vertical segment jumping from said second minimum voltage value to an upper voltage boundary (V sup ) applicable to said drivable coil . - A first step of determining a first minimum voltage value for said drive signal (S,S',S") above which said movable contact starts to move away from said open position (P o ); - A second step of determining a second minimum voltage value for said drive signal (S,S',S") above which said movable contact reaches said closed position (P c ); - And a subsequent step of shaping a waveform (W) for a modified drive signal (S',S") comprising a first portion (W1) consisting of a substantially vertical segment jumping from zero to said first minimum voltage value yielded in previous said first step; followed by a second portion (W2), wherein the voltage is gradually increased from said first minimum voltage value to said second minimum voltage value yielded in previous said second step within a time period shorter or equal to a noise-free linear closing time (T L ) representative of a closing time achievable by applying either actually or theoretically a linear drive signal (S) having a predefined slope (α) in order to remain below said acceptable low noise level (N L ) constraints set for said hybrid relay , and finally a third portion (W3) consisting of another substantially vertical segment jumping from said second minimum voltage value to an upper voltage boundary (V sup ) applicable to said drivable coil . <EOS>