Leakage detection chip-CN54124

The CN54124 is a precision, low-power, Ground Fault Circuit Interrupter (GFCI) controller used for detecting ground fault leakage paths in electrical circuits，witch can detect type A and type AC leakage currents. When the leakage current occurs on the L and N lines, the ZCT(zero current transformer) will detect the leakage current signal，the post-circuit converts the leakage current signal into a voltage signal and transmits it to the input terminal of the chip, when the peak value of the input voltage signal exceeds 4.95mV, the output pin of the chip generates a high level with a minimum duration of 20ms to drive the external SCR. The CN54124 integrates functional modules such as regulated power supply, amplification circuit, comparison circuit, trip controller and trip drive circuit, and only needs current transformer and a small number of resistor capacitors externally.