A leakage current detection and protection device, and power connector and electrical appliance employing the same. The device includes: a leakage current detection module which detects a leakage current on the power lines to generate a leakage fault signal; a self-test module which periodically generates a simulated leakage current and outputs a self-test fault signal when the leakage current detection module is faulty; a trip module, including a switch coupled between the input and output ends of the power lines, and a first trip coil which drives the switch; a drive module which drives the trip module to disconnect the electrical connection between the input and output ends in response to the leakage fault signal and/or the self-test fault signal; and a trip function detection module which generates a trip coil fault signal in response to detecting an open circuit in the first trip coil to disconnect the electrical connection.