This paper presents easily implementable tools for characterization and diagnosis of electrical disturbances caused by fuses operation. A methodology is described, where the use of some descriptors allows identifying electrical disturbances associated with the expulsion fuse operation. This paper aims to provide new tools for assessing the power quality, characterizing and extracting information from the current and voltage records obtained by monitoring in electrical distribution systems. MATLAB is used for validating this methodology, receiving voltage and current records of simulated events in ATP-EMTP and also real events as input.