The current-limiting protector system main unit includes the CPU main control unit, alarm unit, communication unit, and display unit. By connecting to on-site current-limiting protectors, it can accurately receive power data transmitted from the current-limiting protectors. Through calculation and analysis, it determines whether values exceed standards. If values exceed thresholds, it triggers an audible and visual alarm. The current-limiting protector system main unit features a 6-inch LCD screen for displaying real-time on-site measurement data, performing historical data queries, system time settings, alarm parameter configurations, and other operations. The operation interface is simple and user-friendly. It adopts a wall-mounted installation method.