A medium-sensitivity Earth Leakage Circuit Breaker (ELCB) is an electrical safety device designed to detect and respond to ground faults or leakage currents with a moderate sensitivity threshold. Unlike high-sensitivity ELCBs that can detect even small leakage currents (e.g., 10 milliamperes), medium-sensitivity ELCBs typically have a sensitivity threshold in the range of 30 to 300 milliamperes. These devices are commonly used in electrical installations where a slightly higher level of leakage current is acceptable, such as in industrial settings or for specific applications where a high-sensitivity ELCB might lead to false tripping. Medium-sensitivity ELCBs provide a balance between safety and practicality in various electrical systems.