LCDI is short for Leakage Circuit Detector Interrupter, which is designed by UL1699 standard. It is a plug applied to Air conditioning link the power. It contains a 3-core flexible wire and a LCDI plug. LCDI will be tripping operated once the shield wire contact with the any of the 3-core or the leakage circuit beyond the presetting between them. This is an effective way to prevent the animal to get an electric shock and fire accident carried by the leakage circuit or short circuit for the sake of becoming old, bitted, crushed. The shield layer gathers the fault message, so the shield layer can not be grounding or contacting with the machine crust or all naked metals.