Multi-loop type electric leakage fire detector

The utility model relates to a multi-loop type electric leakage fire detector. The fire detector is composed of a shell and a control board disposed inside the shell. The control board is connected to multiple current transformers and passes through the current transformers by a three-phase four-wire connecting method. Each current transformer is arranged on each loop power source of the control board. The control board is electrically connected to a loudspeaker, a display, indicating lamps and buttons. The display, the indicating lamps and the buttons are all arranged on the right surface of the shell. The loudspeaker is arranged on the side surface of the shell. The fire detector employs the current transformers to collect current signals of electric leakage, when phase wires are grounded unsuccessfully, the current transformers generate tiny induction voltage signals and send the induction voltage signals to the control board for cycle detections, after the control board determines the signals, the display