In April 2025, after years of technological tackling, the independently developed Is-lock Fault Current Identification Module by Shaanxi Lanhe Electric Co., Ltd. completed a full set of technical tests at the National Experimental Teaching Demonstration Center for Electrical and Electronic Engineering of Wuhan University. In particular, its response and prediction accuracy for fault currents under different short-circuit phase angles fully meet the technical requirements and have obtained authoritative certification. "Years of in-depth research are dedicated to overcoming one key industry pain point." This achievement not only fills the domestic technical gap in the "selective tripping" of current limiters, but also reaches the international advanced level. It can accurately locate power grid fault areas, providing a new solution for short-circuit protection.