Safety device for industrial machinery , comprising: - at least one sensor configured so as to detect the presence of an abnormal situation for the industrial machine ; - at least one cutout element interposed between a power source or a water source and at least one industrial machine ; - at least one controller connected to the sensor and to the cutout element and configured so as to change the status of the cutout element based on the detection of the presence of an abnormal situation by the sensor , wherein the sensor comprises an electrical sensor configured so as to measure at least one value (Y), among voltage, current and phase between voltage and current, of an electrical conductor (L1, L2, L3, N) connected between a power source and the at least one industrial machine ; characterized in that the controller is configured so as to record the value (Y) measured by the electrical sensor with a predetermined sampling frequency and for a predetermined time interval of at least one day; wherein the controller is configured so as to identify a low value (Ylow) and a high value (Yhigh) among the recorded values, wherein the low value (Ylow) is defined as the lowest value measured during the predetermined time interval, preferably reduced by 10%, and/or wherein the high value (Yhigh) is defined as the highest value measured during the predetermined time interval, preferably increased by 10%, and wherein the controller is configured so as to change the status of the cutout element if the value (Y) measured by the electrical sensor exceeds the high value (Yhigh) and/or is lower than the low value (Ylow), preferably at least for a second predetermined time interval; or wherein the controller is configured so as to change the status of the cutout element if a variation in the value (Y) measured by the electrical sensor exceeds a maximum variation measured during the predetermined time interval. - at least one sensor configured so as to detect the presence of an abnormal situation for the industrial machine ; - at least one cutout element interposed between a power source or a water source and at least one industrial machine ; - at least one controller connected to the sensor and to the cutout element and configured so as to change the status of the cutout element based on the detection of the presence of an abnormal situation by the sensor , wherein the sensor comprises an electrical sensor configured so as to measure at least one value (Y), among voltage, current and phase between voltage and current, of an electrical conductor (L1, L2, L3, N) connected between a power source and the at least one industrial machine ; characterized in that the controller is configured so as to record the value (Y) measured by the electrical sensor with a predetermined sampling frequency and for a predetermined time interval of at least one day; wherein the controller is configured so as to identify a low value (Ylow) and a high value (Yhigh) among the recorded values, wherein the low value (Ylow) is defined as the lowest value measured during the predetermined time interval, preferably reduced by 10%, and/or wherein the high value (Yhigh) is defined as the highest value measured during the predetermined time interval, preferably increased by 10%, and wherein the controller is configured so as to change the status of the cutout element if the value (Y) measured by the electrical sensor exceeds the high value (Yhigh) and/or is lower than the low value (Ylow), preferably at least for a second predetermined time interval; or wherein the controller is configured so as to change the status of the cutout element if a variation in the value (Y) measured by the electrical sensor exceeds a maximum variation measured during the predetermined time interval. <EOS>