Residual-current-type electrical fire detector

The utility model relates to a residual-current-type electrical fire detector. The fire detector comprises a residual current signal collection circuit and a single-chip microcomputer control circuit. An output signal of the residual current signal collection circuit is transmitted to an A/D data conversion circuit through a signal amplification and rectification circuit. An output signal of the A/D data conversion circuit is transmitted to the single-chip microcomputer control circuit. Output signals of the single-chip microcomputer control circuit are transmitted to a Zigbee wireless module circuit, an LCD display circuit and a voice alarm circuit respectively. If a leakage fault occurs in a circuit to be protected, the single-chip microcomputer control circuit performs judgment, the fault current is displayed on the LCD, an acousto-optic alarm is given, the Zigbee wireless module circuit transmits signals, and a data alarm center receives the alarm signals, and displays alarm information, such as alarm add