Abstract: The fault that occurred in the distribution and transmission systems is appropriately and correctly indicated in thispaper using a GSM-based fault detection method. Various safety devices, voltage and current sense sections, microcontrollersections, LED display sections, and GSM (global system for mobile communication) modules are included in the proposedsystem. This device will assist the local electricity board and servicemen in detecting the fault quickly and avoiding transformer damage. The Current transformer, Potential transformer, Microcontroller, RS-232 cable, and GSM modem are all used in this device. With the aid of a Microcontroller, this device detects, analyses, and classifies faults automatically. Thissystem also shows the type of fault occurred in transmission lines, such as L-L (line to line), L-G (line to ground), L-L-G (double line to ground), L-L-L (double line to ground), L-L-L (double line to ground), L-L-L (double line to ground), L-L-G (double line to ground), LL-G (double line to ground), L-L-G (double line to ground), L-L-G (symmetrical fault). This information is then sent to theservice provider via GSM text message.Keywords: Fault, GSM Modem, Transmission Lines, Microcontroller, Line to Line fault, Line to ground fault, LCD.