The utility model relates to an EKL fault indicator, which comprises a grounding current sensor, a signal acquisition circuit, a signal conditioning circuit, a signal processing and control unit, a signal output unit, a nonvolatile storage unit and a timing unit which are sequentially connected. The storage unit and the timing unit are respectively in connection with and further in two-way communication with the signal processing and control unit. The signal processing and control unit is provided with an alarm determining module which compares actually measured amount of current and length of time with preset determining bases involved with the relationship between the two parameters so as to determine whether to give an alarm and the time for alarm delay. The alarm determining module receives the information of the actually measured amount of current and the length of time from the storage unit and sends timing instructions to the timing unit. The EKL fault indicator can directly achieve the function of self-adaptation alarm for a grounding fault, not only broadens alarm application scope and reduces rate of wrong alarm, but also simplifies presetting and modifying operations.