[Features] · Constantly monitors and detects electrical leakages caused by insulation degradation of electrical equipment in low voltage circuits. · Realizes high reliability that enhances high-frequency noise resistance characteristics that support inverter loads. · Compatible with electrical leakage relays and through-type zero-phase current transformers (ZCT). · The ZCT through-type comes with a test terminal and enables electrical leakage relay operation testing to be carried out easily.